{ "document": { "category": "csaf_base", "csaf_version": "2.0", "distribution": { "tlp": { "label": "WHITE" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this portal to enhance access to its information and vulnerabilities. The use of this information is subject to the following terms and conditions:\n\nThe vulnerabilities disclosed in this portal are gathered by NCSC-NL from a variety of open sources, which the user can retrieve from other platforms. NCSC-NL makes every reasonable effort to ensure that the content of this portal is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or real-time keeping up-to-date. NCSC-NL does not control nor guarantee the accuracy, relevance, timeliness or completeness of information obtained from these external sources. The vulnerabilities disclosed in this portal are intended solely for the convenience of professional parties to take appropriate measures to manage the risks posed to the cybersecurity. No rights can be derived from the information provided therein.\n\nNCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of the vulnerabilities disclosed in this portal. This includes damage resulting from the inaccuracy of incompleteness of the information contained in it.\nThe information on this page is subject to Dutch law. All disputes related to or arising from the use of this portal regarding the disclosure of vulnerabilities will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings." } ], "publisher": { "category": "coordinator", "contact_details": "cert@ncsc.nl", "name": "National Cyber Security Centre", "namespace": "https://www.ncsc.nl/" }, "title": "CVE-2026-26963", "tracking": { "current_release_date": "2026-03-21T20:28:20.430777Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-26963", "initial_release_date": "2026-02-19T19:40:15.092010Z", "revision_history": [ { "date": "2026-02-19T19:40:15.092010Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (5).| CWES updated (1)." }, { "date": "2026-02-19T19:40:24.849871Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-02-20T00:13:27.909313Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (1).| References created (4).| CWES updated (1)." }, { "date": "2026-02-20T00:13:30.116934Z", "number": "4", "summary": "NCSC Score updated." }, { "date": "2026-02-20T00:24:52.951513Z", "number": "5", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (4).| CWES updated (1)." }, { "date": "2026-02-20T00:24:55.138210Z", "number": "6", "summary": "NCSC Score updated." }, { "date": "2026-02-20T00:38:44.997351Z", "number": "7", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (1).| References created (4).| CWES updated (1)." }, { "date": "2026-02-20T00:38:51.833824Z", "number": "8", "summary": "NCSC Score updated." }, { "date": "2026-02-20T12:27:45.844669Z", "number": "9", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (92).| Product Identifiers created (12).| References created (6).| CWES updated (1).| Vendor_assessment created." }, { "date": "2026-02-20T12:27:58.595574Z", "number": "10", "summary": "NCSC Score updated." }, { "date": "2026-02-20T14:13:33.597300Z", "number": "11", "summary": "Source created.| CVE status created. (valid)| EPSS created." }, { "date": "2026-02-20T17:04:24.766587Z", "number": "12", "summary": "Unknown change." }, { "date": "2026-02-20T17:04:36.048543Z", "number": "13", "summary": "NCSC Score updated." }, { "date": "2026-02-20T17:39:37.749897Z", "number": "14", "summary": "References created (1)." }, { "date": "2026-02-20T18:12:35.819703Z", "number": "15", "summary": "References created (1)." }, { "date": "2026-02-20T20:27:51.810031Z", "number": "16", "summary": "Products connected (1).| Product Identifiers created (1)." }, { "date": "2026-02-20T20:27:54.446966Z", "number": "17", "summary": "NCSC Score updated." }, { "date": "2026-02-21T12:05:40.276677Z", "number": "18", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (1).| References created (5)." }, { "date": "2026-02-21T12:05:40.601541Z", "number": "19", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (1).| References created (5)." }, { "date": "2026-02-21T12:05:40.937151Z", "number": "20", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (1).| References created (5)." }, { "date": "2026-02-21T12:05:45.729946Z", "number": "21", "summary": "NCSC Score updated." }, { "date": "2026-02-24T00:12:34.287504Z", "number": "22", "summary": "Source created.| CVE status created. (valid)| Description created for source.| References created (5)." }, { "date": "2026-02-24T00:12:42.691076Z", "number": "23", "summary": "NCSC Score updated." }, { "date": "2026-02-26T03:42:38.479915Z", "number": "24", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (9).| Products created (3).| References created (6).| CWES updated (1)." }, { "date": "2026-02-26T03:42:43.633211Z", "number": "25", "summary": "NCSC Score updated." }, { "date": "2026-03-20T09:42:59.765668Z", "number": "26", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-20T09:43:03.248201Z", "number": "27", "summary": "NCSC Score updated." }, { "date": "2026-03-21T18:47:35.658644Z", "number": "28", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (2).| References created (7).| CWES updated (1)." } ], "status": "interim", "version": "28" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/1.18.0", "product": { "name": "vers:unknown/1.18.0", "product_id": "CSAFPID-5213915" } }, { "category": "product_version_range", "name": "vers:unknown/1.18.1", "product": { "name": "vers:unknown/1.18.1", "product_id": "CSAFPID-5213916" } }, { "category": "product_version_range", "name": "vers:unknown/1.18.2", "product": { "name": "vers:unknown/1.18.2", "product_id": "CSAFPID-5213917" } }, { "category": "product_version_range", "name": "vers:unknown/1.18.3", "product": { "name": "vers:unknown/1.18.3", "product_id": "CSAFPID-5213918" } }, { "category": "product_version_range", "name": "vers:unknown/1.18.4", "product": { "name": "vers:unknown/1.18.4", "product_id": "CSAFPID-5317286" } }, { "category": "product_version_range", "name": "vers:unknown/1.18.5", "product": { "name": "vers:unknown/1.18.5", "product_id": "CSAFPID-5724975" } }, { "category": "product_version_range", "name": "vers:unknown/>=1.18.0|<1.18.6", "product": { "name": "vers:unknown/>=1.18.0|<1.18.6", "product_id": "CSAFPID-5642566", "product_identification_helper": { "cpe": "cpe:2.3:a:cilium:cilium:*:*:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/v1.18.0", "product": { "name": "vers:unknown/v1.18.0", "product_id": "CSAFPID-5213934" } }, { "category": "product_version_range", "name": "vers:unknown/v1.18.1", "product": { "name": "vers:unknown/v1.18.1", "product_id": "CSAFPID-5213935" } }, { "category": "product_version_range", "name": "vers:unknown/v1.18.2", "product": { "name": "vers:unknown/v1.18.2", "product_id": "CSAFPID-5213936" } }, { "category": "product_version_range", "name": "vers:unknown/v1.18.3", "product": { "name": "vers:unknown/v1.18.3", "product_id": 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], "category": "product_name", "name": "runc" } ], "category": "product_family", "name": "Red Hat OpenShift Container Platform 4" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-2914835" } } ], "category": "product_name", "name": "delve" } ], "category": "product_family", "name": "Red Hat Enterprise Linux 10" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1488101" } } ], "category": "product_name", "name": "istio-cni-rhel8" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1488102" } } ], "category": "product_name", "name": "pilot-rhel8" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1488104" } } ], "category": "product_name", "name": "proxyv2-rhel9" } ], "category": "product_family", "name": "OpenShift Service Mesh 2" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1441073" } } ], "category": "product_name", "name": "jenkins-agent-base-rhel8" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-2914747" } } ], "category": "product_name", "name": "jenkins-agent-base-rhel9" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1441074" } } ], "category": "product_name", "name": "jenkins-rhel8" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-4684006" } } ], "category": "product_name", "name": "jenkins-rhel9" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-2858769" } } ], "category": "product_name", "name": "ose-jenkins" } ], "category": "product_family", "name": "OpenShift Developer Tools and Services" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1441186" } } ], "category": "product_name", "name": "kubevirt" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-3036192" } } ], "category": "product_name", "name": "ocp-virt-validation-checkup-rhel9" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1441167" } } ], "category": "product_name", "name": "passt-network-binding-plugin-cni-rhel9" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1441168" } } ], "category": "product_name", "name": "passt-network-binding-plugin-sidecar-rhel9" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1441169" } } ], "category": "product_name", "name": "sidecar-shim-rhel9" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1441170" } } ], "category": "product_name", "name": "virt-api" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1441171" } } ], "category": "product_name", "name": "virt-api-rhel9" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1441172" } } ], "category": "product_name", "name": "virt-artifacts-server" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1441173" } } ], "category": "product_name", "name": "virt-artifacts-server-rhel9" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1441174" } } ], "category": "product_name", "name": "virt-controller" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1441175" } } ], "category": "product_name", "name": "virt-controller-rhel9" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1441176" } } ], "category": "product_name", "name": "virt-exportproxy" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1441177" } } ], "category": "product_name", "name": "virt-exportproxy-rhel9" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1441178" } } ], "category": "product_name", "name": "virt-exportserver" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1441179" } } ], "category": "product_name", "name": "virt-exportserver-rhel9" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1441180" } } ], "category": "product_name", "name": "virt-handler" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1441181" } } ], "category": "product_name", "name": "virt-handler-rhel9" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1441182" } } ], "category": "product_name", "name": "virt-launcher" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1441183" } } ], "category": "product_name", "name": "virt-launcher-rhel9" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1441184" } } ], "category": "product_name", "name": "virt-operator" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1441185" } } ], "category": "product_name", "name": "virt-operator-rhel9" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-5180262" } } ], "category": "product_name", "name": "virt-synchronization-controller-rhel9" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1496426" } } ], "category": "product_name", "name": "wasp-agent-rhel9" } ], "category": "product_family", "name": "Red Hat OpenShift Virtualization 4" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-2914734" } } ], "category": "product_name", "name": "multicluster-globalhub-grafana-rhel9" } ], "category": "product_family", "name": "Multicluster Global Hub" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-2485112" } } ], "category": "product_name", "name": "network-observability-ebpf-agent-rhel9" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-2485113" } } ], "category": "product_name", "name": "network-observability-flowlogs-pipeline-rhel9" } ], "category": "product_family", "name": "Network Observability Operator" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-3036153" } } ], "category": "product_name", "name": "osc-monitor-rhel9" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-3049532" } } ], "category": "product_name", "name": "osc-operator-bundle" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-3049533" } } ], "category": "product_name", "name": "osc-podvm-builder-rhel9" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-3036154" } } ], "category": "product_name", "name": "osc-podvm-payload-rhel9" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-3036155" } } ], "category": "product_name", "name": "osc-rhel9-operator" } ], "category": "product_family", "name": "Confidential Compute Attestation" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1441097" } } ], "category": "product_name", "name": "podman" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1919985" } } ], "category": "product_name", "name": "runc" } ], "category": "product_family", "name": "Red Hat Enterprise Linux 8" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1441100" } } ], "category": "product_name", "name": "podman" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1920000" } } ], "category": "product_name", "name": "runc" } ], "category": "product_family", "name": "Red Hat Enterprise Linux 9" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-2858790" } } ], "category": "product_name", "name": "windows-machine-config-operator-bundle" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-2858791" } } ], "category": "product_name", "name": "windows-machine-config-rhel9-operator" } ], "category": "product_family", "name": "Red Hat OpenShift for Windows Containers" } ], "category": "vendor", "name": "Red Hat" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/>=1.18.0|<1.18.6", "product": { "name": "vers:unknown/>=1.18.0|<1.18.6", "product_id": "CSAFPID-5658432" } } ], "category": "product_name", "name": "cilium" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/>=1.18.0|<1.18.6", "product": { "name": "vers:unknown/>=1.18.0|<1.18.6", "product_id": "CSAFPID-5658433" } } ], "category": "product_name", "name": "cilium-operator" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/>=1.18.0|<1.18.6", "product": { "name": "vers:unknown/>=1.18.0|<1.18.6", "product_id": "CSAFPID-5658434" } } ], "category": "product_name", "name": "hubble-relay" } ], "category": "vendor", "name": "Bitnami" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/1.18.6", "product": { "name": "vers:unknown/1.18.6", "product_id": "CSAFPID-5888524" } }, { "category": "product_version_range", "name": "vers:unknown/>=1.18.0|<1.18.6", "product": { "name": "vers:unknown/>=1.18.0|<1.18.6", "product_id": "CSAFPID-5888525" } } ], "category": "product_name", "name": "go/github.com/cilium/cilium" } ], "category": "vendor", "name": "cilium" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-26963", "cwe": { "id": "CWE-863", "name": "Incorrect Authorization" }, "notes": [ { "category": "description", "text": "### Impact\n\n[Host Policies](https://docs.cilium.io/en/stable/security/policy/language/#host-policies) will incorrectly permit traffic from Pods on other nodes when all of the following configurations are enabled:\n* [Native Routing](https://docs.cilium.io/en/stable/network/concepts/routing/#native-routing)\n* [WireGuard](https://docs.cilium.io/en/stable/security/policy/language/#host-policies)\n* [Node Encryption](https://docs.cilium.io/en/stable/security/network/encryption-wireguard/#node-to-node-encryption-beta) (beta)\n\nThese options are disabled by default in Cilium.\n\n### Patches\n\nThis issue was fixed by #42892.\n\nThis issue affects:\n\n* Cilium v1.18 between v1.18.0 and v1.18.5 inclusive\n\nThis issue is fixed in:\n\n* Cilium v1.18.6\n\n### Workarounds\n\nThere is currently no officially verified or comprehensive workaround for this issue. The following procedure has been validated strictly within a local 'Kind' environment and has not undergone exhaustive testing across diverse production architectures. Proceed with caution.\n\nTo mitigate the identified traffic bypass, ensure all ingress traffic from the `cilium_wg0` interface is explicitly routed to `cilium_host` for policy enforcement. This ensures that host-level security policies are applied to decrypted WireGuard traffic. Execute the following configuration on each CiliumNode:\n\n```bash\n# IPv4 Traffic\nip rule add iif cilium_wg0 table 300\nip route add default dev cilium_host table 300\n\n# IPv6 Traffic\nip -6 rule add iif cilium_wg0 table 300\nip -6 route add default dev cilium_net table 300\n```\n\n### Acknowledgements\n\nSpecial thanks to @julianwiedmann for reporting the issue and helping with the resolution.\n\n### For more information\n\nIf you think you have found a vulnerability affecting Cilium, we strongly encourage you to report it to our security mailing list at security@cilium.io. This is a private mailing list for the Cilium security team, and your report will be treated as top priority. Please also address any comments or questions on this advisory to the same mailing list.", "title": "github - https://github.com/advisories/GHSA-5r23-prx4-mqg3" }, { "category": "description", "text": "### Impact\n\n[Host Policies](https://docs.cilium.io/en/stable/security/policy/language/#host-policies) will incorrectly permit traffic from Pods on other nodes when all of the following configurations are enabled:\n* [Native Routing](https://docs.cilium.io/en/stable/network/concepts/routing/#native-routing)\n* [WireGuard](https://docs.cilium.io/en/stable/security/policy/language/#host-policies)\n* [Node Encryption](https://docs.cilium.io/en/stable/security/network/encryption-wireguard/#node-to-node-encryption-beta) (beta)\n\nThese options are disabled by default in Cilium.\n\n### Patches\n\nThis issue was fixed by #42892.\n\nThis issue affects:\n\n* Cilium v1.18 between v1.18.0 and v1.18.5 inclusive\n\nThis issue is fixed in:\n\n* Cilium v1.18.6\n\n### Workarounds\n\nThere is currently no officially verified or comprehensive workaround for this issue. The following procedure has been validated strictly within a local 'Kind' environment and has not undergone exhaustive testing across diverse production architectures. Proceed with caution.\n\nTo mitigate the identified traffic bypass, ensure all ingress traffic from the `cilium_wg0` interface is explicitly routed to `cilium_host` for policy enforcement. This ensures that host-level security policies are applied to decrypted WireGuard traffic. Execute the following configuration on each CiliumNode:\n\n```bash\n# IPv4 Traffic\nip rule add iif cilium_wg0 table 300\nip route add default dev cilium_host table 300\n\n# IPv6 Traffic\nip -6 rule add iif cilium_wg0 table 300\nip -6 route add default dev cilium_net table 300\n```\n\n### Acknowledgements\n\nSpecial thanks to @julianwiedmann for reporting the issue and helping with the resolution.\n\n### For more information\n\nIf you think you have found a vulnerability affecting Cilium, we strongly encourage you to report it to our security mailing list at security@cilium.io. This is a private mailing list for the Cilium security team, and your report will be treated as top priority. Please also address any comments or questions on this advisory to the same mailing list.", "title": "osv - https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Go%2FGHSA-5r23-prx4-mqg3.json?alt=media" }, { "category": "description", "text": "Cilium is a networking, observability, and security solution with an eBPF-based dataplane. Versions 1.18.0 through 1.18.5 will incorrectly permit traffic from Pods on other nodes when Native Routing, WireGuard and Node Encryption are enabled. This issue has been fixed in version 1.18.6.", "title": "nvd - https://nvd.nist.gov/vuln/detail/CVE-2026-26963" }, { "category": "description", "text": "Cilium is a networking, observability, and security solution with an eBPF-based dataplane. Versions 1.18.0 through 1.18.5 will incorrectly permit traffic from Pods on other nodes when Native Routing, WireGuard and Node Encryption are enabled. This issue has been fixed in version 1.18.6.", "title": "cveprojectv5 - https://www.cve.org/CVERecord?id=CVE-2026-26963" }, { "category": "description", "text": "A flaw was found in Cilium. When specific network configurations, including Native Routing, WireGuard, and Node Encryption, are enabled, Cilium incorrectly allows network traffic from Pods on other nodes. This can lead to unauthorized access to network communications and potential information disclosure.", "title": "redhat - https://access.redhat.com/security/cve/CVE-2026-26963" }, { "category": "description", "text": "Cilium is a networking, observability, and security solution with an eBPF-based dataplane. Versions 1.18.0 through 1.18.5 will incorrectly permit traffic from Pods on other nodes when Native Routing, WireGuard and Node Encryption are enabled. This issue has been fixed in version 1.18.6.", "title": "osv - https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Bitnami%2FBIT-cilium-2026-26963.json?alt=media" }, { "category": "description", "text": "Cilium is a networking, observability, and security solution with an eBPF-based dataplane. Versions 1.18.0 through 1.18.5 will incorrectly permit traffic from Pods on other nodes when Native Routing, WireGuard and Node Encryption are enabled. This issue has been fixed in version 1.18.6.", "title": "osv - https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Bitnami%2FBIT-cilium-operator-2026-26963.json?alt=media" }, { "category": "description", "text": "Cilium is a networking, observability, and security solution with an eBPF-based dataplane. Versions 1.18.0 through 1.18.5 will incorrectly permit traffic from Pods on other nodes when Native Routing, WireGuard and Node Encryption are enabled. This issue has been fixed in version 1.18.6.", "title": "osv - https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Bitnami%2FBIT-hubble-relay-2026-26963.json?alt=media" }, { "category": "description", "text": "Cilium may not enforce host firewall policies when Native Routing, WireGuard and Node Encryption are enabled in github.com/cilium/cilium", "title": "osv - https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Go%2FGO-2026-4522.json?alt=media" }, { "category": "description", "text": "Cilium is a networking, observability, and security solution with an eBPF-based dataplane. Versions 1.18.0 through 1.18.5 will incorrectly permit traffic from Pods on other nodes when Native Routing, WireGuard and Node Encryption are enabled. This issue has been fixed in version 1.18.6.", "title": "osv - https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/GIT%2FCVE-2026-26963.json?alt=media" }, { "category": "description", "text": "[Host Policies](https://docs.cilium.io/en/stable/security/policy/language/#host-policies) will incorrectly permit traffic from Pods on other nodes when all of the following configurations are enabled:\n* [Native Routing](https://docs.cilium.io/en/stable/network/concepts/routing/#native-routing)\n* [WireGuard](https://docs.cilium.io/en/stable/security/policy/language/#host-policies)\n* [Node Encryption](https://docs.cilium.io/en/stable/security/network/encryption-wireguard/#node-to-node-encryption-beta) (beta)\n\nThese options are disabled by default in Cilium.", "title": "gitlab - https://gitlab.com/api/v4/projects/25847700/repository/files/go%2Fgithub.com%2Fcilium%2Fcilium%2FCVE-2026-26963.yml/raw" }, { "category": "other", "text": "0.00011", "title": "EPSS" }, { "category": "other", "text": "5.5", "title": "NCSC Score" }, { "category": "other", "text": "Is related to CWE-863 (Incorrect Authorization), Is related to CWE-266 (Incorrect Privilege Assignment), There is product data available from source Nvd", "title": "NCSC Score top increasing factors" }, { "category": "other", "text": "Is related to (a version of) an uncommon product", "title": "NCSC Score top decreasing factors" }, { "category": "details", "text": "Severity: 2\n", "title": "Vendor assessment" } ], "product_status": { "fixed": [ "CSAFPID-5888524" ], "known_affected": [ "CSAFPID-5642566", "CSAFPID-5658432", "CSAFPID-5658433", "CSAFPID-5658434", "CSAFPID-5213915", "CSAFPID-5213916", "CSAFPID-5213917", "CSAFPID-5213918", "CSAFPID-5213934", "CSAFPID-5213935", "CSAFPID-5213936", "CSAFPID-5213937", "CSAFPID-5317286", "CSAFPID-5724975", "CSAFPID-5724976", "CSAFPID-5724977", "CSAFPID-5888525" ], "known_not_affected": [ "CSAFPID-1439317", "CSAFPID-1439319", "CSAFPID-1439328", "CSAFPID-1441072", "CSAFPID-1441073", "CSAFPID-1441074", "CSAFPID-1441080", "CSAFPID-1441097", "CSAFPID-1441100", "CSAFPID-1441108", "CSAFPID-1441110", "CSAFPID-1441126", "CSAFPID-1441140", "CSAFPID-1441141", "CSAFPID-1441143", "CSAFPID-1441144", "CSAFPID-1441146", "CSAFPID-1441162", "CSAFPID-1441167", "CSAFPID-1441168", "CSAFPID-1441169", "CSAFPID-1441170", "CSAFPID-1441171", "CSAFPID-1441172", "CSAFPID-1441173", "CSAFPID-1441174", "CSAFPID-1441175", "CSAFPID-1441176", "CSAFPID-1441177", "CSAFPID-1441178", "CSAFPID-1441179", "CSAFPID-1441180", "CSAFPID-1441181", "CSAFPID-1441182", "CSAFPID-1441183", "CSAFPID-1441184", "CSAFPID-1441185", "CSAFPID-1441186", "CSAFPID-1488100", "CSAFPID-1488101", "CSAFPID-1488102", "CSAFPID-1488104", "CSAFPID-1496280", "CSAFPID-1496426", "CSAFPID-1919985", "CSAFPID-1920000", "CSAFPID-1920008", "CSAFPID-1920012", "CSAFPID-2109924", "CSAFPID-2109929", "CSAFPID-2109943", "CSAFPID-2159488", "CSAFPID-2257522", "CSAFPID-2485112", "CSAFPID-2485113", "CSAFPID-2485143", "CSAFPID-2485290", "CSAFPID-2485292", "CSAFPID-2543605", "CSAFPID-2552008", "CSAFPID-2552047", "CSAFPID-2563058", "CSAFPID-2563059", "CSAFPID-2847229", "CSAFPID-2847230", "CSAFPID-2855766", "CSAFPID-2858634", "CSAFPID-2858769", "CSAFPID-2858774", "CSAFPID-2858781", "CSAFPID-2858787", "CSAFPID-2858789", "CSAFPID-2858790", "CSAFPID-2858791", "CSAFPID-2905027", "CSAFPID-2914734", "CSAFPID-2914747", "CSAFPID-2914773", "CSAFPID-2914798", "CSAFPID-2914835", "CSAFPID-2914951", "CSAFPID-2914979", "CSAFPID-2914997", "CSAFPID-2915000", "CSAFPID-3036153", "CSAFPID-3036154", "CSAFPID-3036155", "CSAFPID-3036192", "CSAFPID-3049532", "CSAFPID-3049533", "CSAFPID-4684006", "CSAFPID-5180262" ] }, "references": [ { "category": "external", "summary": "Source - github", "url": "https://github.com/advisories/GHSA-5r23-prx4-mqg3" }, { "category": "external", "summary": "Source raw - github", "url": "https://api.github.com/advisories/GHSA-5r23-prx4-mqg3" }, { "category": "external", "summary": "Source - osv", "url": "https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Go%2FGHSA-5r23-prx4-mqg3.json?alt=media" }, { "category": "external", "summary": "Source - nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-26963" }, { "category": "external", "summary": "Source raw - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-26963" }, { "category": "external", "summary": "Source - cveprojectv5", "url": "https://www.cve.org/CVERecord?id=CVE-2026-26963" }, { "category": "external", "summary": "Source raw - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/26xxx/CVE-2026-26963.json" }, { "category": "external", "summary": "Source - redhat", "url": "https://access.redhat.com/security/cve/CVE-2026-26963" }, { "category": "external", "summary": "Source raw - redhat", "url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-26963.json" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-26963" }, { "category": "external", "summary": "Source raw - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - osv", "url": "https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Bitnami%2FBIT-cilium-2026-26963.json?alt=media" }, { "category": "external", "summary": "Source - osv", "url": "https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Bitnami%2FBIT-cilium-operator-2026-26963.json?alt=media" }, { "category": "external", "summary": "Source - osv", "url": "https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Bitnami%2FBIT-hubble-relay-2026-26963.json?alt=media" }, { "category": "external", "summary": "Source - osv", "url": "https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Go%2FGO-2026-4522.json?alt=media" }, { "category": "external", "summary": "Source - osv", "url": "https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/GIT%2FCVE-2026-26963.json?alt=media" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - gitlab", "url": "https://gitlab.com/api/v4/projects/25847700/repository/files/go%2Fgithub.com%2Fcilium%2Fcilium%2FCVE-2026-26963.yml/raw" }, { "category": "external", "summary": "Reference - cveprojectv5; github; gitlab; nvd; osv; redhat", "url": "https://github.com/cilium/cilium/security/advisories/GHSA-5r23-prx4-mqg3" }, { "category": "external", "summary": "Reference - cveprojectv5; github; gitlab; nvd; osv; redhat", "url": "https://github.com/cilium/cilium/pull/42892" }, { "category": "external", "summary": "Reference - cveprojectv5; github; gitlab; nvd; osv; redhat", "url": "https://github.com/cilium/cilium/commit/88e28e1e62c0b1a02c3f0fc22d888ac9eefbe885" }, { "category": "external", "summary": "Reference - cveprojectv5; github; gitlab; nvd; osv; redhat", "url": "https://github.com/cilium/cilium/releases/tag/v1.18.6" }, { "category": "external", "summary": "Reference - github; gitlab", "url": "https://github.com/advisories/GHSA-5r23-prx4-mqg3" }, { "category": "external", "summary": "Reference - redhat", "url": "https://www.cve.org/CVERecord?id=CVE-2026-26963" }, { "category": "external", "summary": "Reference - github; gitlab; osv; redhat", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-26963" }, { "category": "external", "summary": "Reference - osv", "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26963.json" }, { "category": "external", "summary": "Reference - gitlab", "url": "https://github.com/cilium/cilium" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N", "baseScore": 6.1, "baseSeverity": "MEDIUM" }, "products": [ "CSAFPID-5213915", "CSAFPID-5213916", "CSAFPID-5213917", "CSAFPID-5213918", "CSAFPID-5213934", "CSAFPID-5213935", "CSAFPID-5213936", "CSAFPID-5213937", "CSAFPID-5317286", "CSAFPID-5642566", "CSAFPID-5658432", "CSAFPID-5658433", "CSAFPID-5658434", "CSAFPID-5724975", "CSAFPID-5724976", "CSAFPID-5724977", "CSAFPID-5888525" ] } ], "title": "CVE-2026-26963" } ] }