{ "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-2026-33219", "tracking": { "current_release_date": "2026-03-29T01:16:17.120298Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-33219", "initial_release_date": "2026-03-24T23:11:53.300465Z", "revision_history": [ { "date": "2026-03-24T23:11:53.300465Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (5).| CWES updated (1)." }, { "date": "2026-03-24T23:12:02.335490Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-03-25T11:36:08.203793Z", "number": "3", "summary": "NCSC Score updated." }, { "date": "2026-03-25T13:15:12.360294Z", "number": "4", "summary": "Source connected.| CVE status created. (valid)| Products connected (2).| References created (13)." }, { "date": "2026-03-25T13:15:27.024206Z", "number": "5", "summary": "NCSC Score updated." }, { "date": "2026-03-25T18:12:46.936492Z", "number": "6", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (2).| References created (4).| CWES updated (1)." }, { "date": "2026-03-25T20:42:22.362860Z", "number": "7", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (2).| References created (4).| CWES updated (1).| Unknown change." }, { "date": "2026-03-25T20:42:25.576987Z", "number": "8", "summary": "NCSC Score updated." }, { "date": "2026-03-25T20:53:18.966085Z", "number": "9", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (4).| CWES updated (1)." }, { "date": "2026-03-25T20:53:24.138270Z", "number": "10", "summary": "NCSC Score updated." }, { "date": "2026-03-26T00:28:09.122112Z", "number": "11", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (4).| Product Identifiers created (2).| Product Remediations created (4).| References created (6).| CWES updated (1).| Vendor_assessment created." }, { "date": "2026-03-26T00:28:18.156241Z", "number": "12", "summary": "NCSC Score updated." }, { "date": "2026-03-26T12:44:26.604175Z", "number": "13", "summary": "Source created.| CVE status created. (valid)| Description created for source.| Products connected (1)." }, { "date": "2026-03-26T12:44:28.220900Z", "number": "14", "summary": "NCSC Score updated." }, { "date": "2026-03-26T15:02:19.070177Z", "number": "15", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-26T17:27:58.735653Z", "number": "16", "summary": "Products connected (2).| Product Identifiers created (2)." }, { "date": "2026-03-26T17:28:01.743381Z", "number": "17", "summary": "NCSC Score updated." }, { "date": "2026-03-27T00:13:56.868391Z", "number": "18", "summary": "Source created.| CVE status created. (valid)| Description created for source.| References created (4)." }, { "date": "2026-03-27T00:13:58.668940Z", "number": "19", "summary": "NCSC Score updated." }, { "date": "2026-03-28T07:57:40.403293Z", "number": "20", "summary": "References created (1)." }, { "date": "2026-03-28T07:57:50.732817Z", "number": "21", "summary": "NCSC Score updated." }, { "date": "2026-03-28T08:10:34.293822Z", "number": "22", "summary": "References removed (1)." }, { "date": "2026-03-29T01:16:10.507941Z", "number": "23", "summary": "References created (1)." } ], "status": "interim", "version": "23" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-2552008", "product_identification_helper": { "cpe": "cpe:/a:redhat:multicluster_globalhub" } } } ], "category": "product_name", "name": "Multicluster Global Hub" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/4", "product": { "name": "vers:rpm/4", "product_id": "CSAFPID-1439328", "product_identification_helper": { "cpe": "cpe:/a:redhat:openshift:4" } } } ], "category": "product_name", "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-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-2257522" } } ], "category": "product_name", "name": "oc-mirror-plugin-rhel9" } ], "category": "product_family", "name": "Red Hat OpenShift Container Platform 4" } ], "category": "vendor", "name": "Red Hat" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<2.11.15", "product": { "name": "vers:unknown/<2.11.15", "product_id": "CSAFPID-5906252" } }, { "category": "product_version_range", "name": "vers:unknown/<2.12.6", "product": { "name": "vers:unknown/<2.12.6", "product_id": "CSAFPID-5906253" } } ], "category": "product_name", "name": "NATS Server" } ], "category": "vendor", "name": "Open Source" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<2.11.15", "product": { "name": "vers:unknown/<2.11.15", "product_id": "CSAFPID-5903111" } }, { "category": "product_version_range", "name": "vers:unknown/>=0|<2.11.15", "product": { "name": "vers:unknown/>=0|<2.11.15", "product_id": "CSAFPID-5907189" } }, { "category": "product_version_range", "name": "vers:unknown/>=2.12.0-rc.1|<2.12.6", "product": { "name": "vers:unknown/>=2.12.0-rc.1|<2.12.6", "product_id": "CSAFPID-5903112" } } ], "category": "product_name", "name": "Nats Server" } ], "category": "vendor", "name": "Nats" }, { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:deb/unknown", "product": { "name": "vers:deb/unknown", "product_id": "CSAFPID-2649998" } } ], "category": "product_name", "name": "nats-server" } ], "category": "product_family", "name": "bookworm" } ], "category": "vendor", "name": "Debian" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<2.11.15", "product": { "name": "vers:unknown/<2.11.15", "product_id": "CSAFPID-5918227", "product_identification_helper": { "cpe": "cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/>=2.12.0|<2.12.6", "product": { "name": "vers:unknown/>=2.12.0|<2.12.6", "product_id": "CSAFPID-5918228", "product_identification_helper": { "cpe": "cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "nats-server" } ], "category": "vendor", "name": "linuxfoundation" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-33219", "cwe": { "id": "CWE-770", "name": "Allocation of Resources Without Limits or Throttling" }, "notes": [ { "category": "description", "text": "### Background\n\nNATS.io is a high performance open source pub-sub distributed communication technology, built for the cloud, on-premise, IoT, and edge computing.\n\nThe nats-server offers a WebSockets client service, used in deployments where browsers are the NATS clients.\n\n### Problem Description\n\nA malicious client which can connect to the WebSockets port can cause unbounded memory use in the nats-server before authentication; this requires sending a corresponding amount of data.\n\nThis is a milder variant of [NATS-advisory-ID 2026-02](https://advisories.nats.io/CVE/secnote-2026-02.txt) (aka CVE-2026-27571; GHSA-qrvq-68c2-7grw).\nThat earlier issue was a compression bomb, this vulnerability is not. Attacks against this new issue thus require significant client bandwidth.\n\n### Affected Versions\n\nAny version before v2.12.6 or v2.11.15\n\n### Workarounds\n\nDisable websockets if not required for project deployment.", "title": "github - https://api.github.com/advisories/GHSA-8r68-gvr4-jh7j" }, { "category": "description", "text": "### Background\n\nNATS.io is a high performance open source pub-sub distributed communication technology, built for the cloud, on-premise, IoT, and edge computing.\n\nThe nats-server offers a WebSockets client service, used in deployments where browsers are the NATS clients.\n\n### Problem Description\n\nA malicious client which can connect to the WebSockets port can cause unbounded memory use in the nats-server before authentication; this requires sending a corresponding amount of data.\n\nThis is a milder variant of [NATS-advisory-ID 2026-02](https://advisories.nats.io/CVE/secnote-2026-02.txt) (aka CVE-2026-27571; GHSA-qrvq-68c2-7grw).\nThat earlier issue was a compression bomb, this vulnerability is not. Attacks against this new issue thus require significant client bandwidth.\n\n### Affected Versions\n\nAny version before v2.12.6 or v2.11.15\n\n### Workarounds\n\nDisable websockets if not required for project deployment.", "title": "osv - https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Go%2FGHSA-8r68-gvr4-jh7j.json?alt=media" }, { "category": "description", "text": "NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, a malicious client which can connect to the WebSockets port can cause unbounded memory use in the nats-server before authentication; this requires sending a corresponding amount of data. This is a milder variant of CVE-2026-27571. That earlier issue was a compression bomb, this vulnerability is not. Attacks against this new issue thus require significant client bandwidth. Versions 2.11.15 and 2.12.6 contain a fix. As a workaround, disable websockets if not required for project deployment.", "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/33xxx/CVE-2026-33219.json" }, { "category": "description", "text": "NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, a malicious client which can connect to the WebSockets port can cause unbounded memory use in the nats-server before authentication; this requires sending a corresponding amount of data. This is a milder variant of CVE-2026-27571. That earlier issue was a compression bomb, this vulnerability is not. Attacks against this new issue thus require significant client bandwidth. Versions 2.11.15 and 2.12.6 contain a fix. As a workaround, disable websockets if not required for project deployment.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-33219" }, { "category": "description", "text": "A flaw was found in NATS-Server. A malicious client connecting to the WebSockets port can cause unbounded memory use before authentication by sending a large amount of data. This resource exhaustion vulnerability can lead to a Denial of Service (DoS) for the server, making it unavailable to legitimate users.", "title": "redhat - https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-33219.json" }, { "category": "description", "text": "NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, a malicious client which can connect to the WebSockets port can cause unbounded memory use in the nats-server before authentication; this requires sending a corresponding amount of data. This is a milder variant of CVE-2026-27571. That earlier issue was a compression bomb, this vulnerability is not. Attacks against this new issue thus require significant client bandwidth. Versions 2.11.15 and 2.12.6 contain a fix. As a workaround, disable websockets if not required for project deployment.", "title": "debian - https://security-tracker.debian.org/tracker/CVE-2026-33219" }, { "category": "description", "text": "NATS is vulnerable to pre-auth DoS through WebSockets client service in github.com/nats-io/nats-server", "title": "osv - https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Go%2FGO-2026-4831.json?alt=media" }, { "category": "other", "text": "0.00059", "title": "EPSS" }, { "category": "other", "text": "4.3", "title": "NCSC Score" }, { "category": "other", "text": "There is product data available from source Certbundde", "title": "NCSC Score top increasing factors" }, { "category": "other", "text": "Is related to CWE-404 (Improper Resource Shutdown or Release), There is product data available from source Debian, Is related to a product by vendor Debian, Is related to (a version of) an uncommon product", "title": "NCSC Score top decreasing factors" }, { "category": "details", "text": "Severity: 3\n", "title": "Vendor assessment" } ], "product_status": { "known_affected": [ "CSAFPID-5906252", "CSAFPID-5906253", "CSAFPID-5903112", "CSAFPID-5907189", "CSAFPID-5903111", "CSAFPID-1439328", "CSAFPID-2257522", "CSAFPID-2552008", "CSAFPID-2914734", "CSAFPID-2649998", "CSAFPID-5918227", "CSAFPID-5918228" ] }, "references": [ { "category": "external", "summary": "Source - github", "url": "https://api.github.com/advisories/GHSA-8r68-gvr4-jh7j" }, { "category": "external", "summary": "Source - certbundde", "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0858.json" }, { "category": "external", "summary": "Source - osv", "url": "https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Go%2FGHSA-8r68-gvr4-jh7j.json?alt=media" }, { "category": "external", "summary": "Source - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/33xxx/CVE-2026-33219.json" }, { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-33219" }, { "category": "external", "summary": "Source - redhat", "url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-33219.json" }, { "category": "external", "summary": "Source - debian", "url": "https://security-tracker.debian.org/tracker/CVE-2026-33219" }, { "category": "external", "summary": "Source - 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/Go%2FGO-2026-4831.json?alt=media" }, { "category": "external", "summary": "Reference - cveprojectv5; github; nvd; osv; redhat", "url": "https://github.com/nats-io/nats-server/security/advisories/GHSA-8r68-gvr4-jh7j" }, { "category": "external", "summary": "Reference - cveprojectv5; github; nvd; osv; redhat", "url": "https://advisories.nats.io/CVE/secnote-2026-02.txt" }, { "category": "external", "summary": "Reference - certbundde; cveprojectv5; github; nvd; osv; redhat", "url": "https://advisories.nats.io/CVE/secnote-2026-11.txt" }, { "category": "external", "summary": "Reference - cveprojectv5; github; nvd; osv; redhat", "url": "https://github.com/advisories/GHSA-qrvq-68c2-7grw" }, { "category": "external", "summary": "Reference - github", "url": "https://github.com/advisories/GHSA-8r68-gvr4-jh7j" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0858.json" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-0858" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://advisories.nats.io/CVE/secnote-2026-05.txt" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://advisories.nats.io/CVE/secnote-2026-06.txt" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://advisories.nats.io/CVE/secnote-2026-07.txt" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://advisories.nats.io/CVE/secnote-2026-08.txt" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://advisories.nats.io/CVE/secnote-2026-09.txt" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://advisories.nats.io/CVE/secnote-2026-10.txt" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://advisories.nats.io/CVE/secnote-2026-12.txt" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://advisories.nats.io/CVE/secnote-2026-13.txt" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://advisories.nats.io/CVE/secnote-2026-14.txt" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://advisories.nats.io/CVE/secnote-2026-15.txt" }, { "category": "external", "summary": "Reference - redhat", "url": "https://www.cve.org/CVERecord?id=CVE-2026-33219" }, { "category": "external", "summary": "Reference - github; redhat", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33219" } ], "remediations": [ { "category": "mitigation", "details": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.", "product_ids": [ "CSAFPID-1439328", "CSAFPID-2257522", "CSAFPID-2552008", "CSAFPID-2914734" ] } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH" }, "products": [ "CSAFPID-1439328", "CSAFPID-2257522", "CSAFPID-2552008", "CSAFPID-2649998", "CSAFPID-2914734", "CSAFPID-5903111", "CSAFPID-5903112", "CSAFPID-5906252", "CSAFPID-5906253", "CSAFPID-5907189", "CSAFPID-5918227", "CSAFPID-5918228" ] } ], "title": "CVE-2026-33219" } ] }