{ "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-2026-33945", "tracking": { "current_release_date": "2026-04-01T18:28:46.915339Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-33945", "initial_release_date": "2026-03-26T23:38:52.124793Z", "revision_history": [ { "date": "2026-03-26T23:38:52.124793Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (1).| References created (1).| CWES updated (1)." }, { "date": "2026-03-26T23:38:54.410584Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-03-27T00:25:28.098689Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (1).| CWES updated (1)." }, { "date": "2026-03-27T00:25:32.552446Z", "number": "4", "summary": "NCSC Score updated." }, { "date": "2026-03-27T06:43:24.656849Z", "number": "5", "summary": "Source created.| CVE status created. (valid)| Description created for source.| Products connected (1)." }, { "date": "2026-03-27T06:43:27.727118Z", "number": "6", "summary": "NCSC Score updated." }, { "date": "2026-03-27T07:35:35.583203Z", "number": "7", "summary": "NCSC Score updated." }, { "date": "2026-03-27T19:41:44.870781Z", "number": "8", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (3).| CWES updated (1).| Vendor_assessment created." }, { "date": "2026-03-27T19:41:59.002463Z", "number": "9", "summary": "NCSC Score updated." }, { "date": "2026-03-27T19:47:34.578718Z", "number": "10", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (1).| References created (3).| CWES updated (1)." }, { "date": "2026-03-27T19:47:48.583505Z", "number": "11", "summary": "NCSC Score updated." }, { "date": "2026-03-27T20:56:06.558182Z", "number": "12", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-27T21:27:09.707577Z", "number": "13", "summary": "Unknown change." }, { "date": "2026-03-28T07:41:30.023035Z", "number": "14", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (4).| CWES updated (1)." }, { "date": "2026-03-28T07:41:32.268571Z", "number": "15", "summary": "NCSC Score updated." }, { "date": "2026-04-01T18:27:47.364964Z", "number": "16", "summary": "Products connected (1).| Product Identifiers created (1)." }, { "date": "2026-04-01T18:27:49.606953Z", "number": "17", "summary": "NCSC Score updated." } ], "status": "interim", "version": "17" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<6.23.0", "product": { "name": "vers:unknown/<6.23.0", "product_id": "CSAFPID-5965579", "product_identification_helper": { "cpe": "cpe:2.3:a:linuxcontainers:incus:*:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "incus" } ], "category": "vendor", "name": "linuxcontainers" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<6.23.0", "product": { "name": "vers:unknown/<6.23.0", "product_id": "CSAFPID-5919453" } }, { "category": "product_version_range", "name": "vers:unknown/>=0|<6.23.0", "product": { "name": "vers:unknown/>=0|<6.23.0", "product_id": "CSAFPID-5944290" } } ], "category": "product_name", "name": "incus" } ], "category": "vendor", "name": "lxc" }, { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:deb/unknown", "product": { "name": "vers:deb/unknown", "product_id": "CSAFPID-2752898" } } ], "category": "product_name", "name": "lxd" } ], "category": "product_family", "name": "bookworm" } ], "category": "vendor", "name": "Debian" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-33945", "cwe": { "id": "CWE-22", "name": "Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')" }, "notes": [ { "category": "description", "text": "Incus is a system container and virtual machine manager. Incus instances have an option to provide credentials to systemd in the guest. For containers, this is handled through a shared directory. Prior to version 6.23.0, an attacker can set a configuration key named something like `systemd.credential.../../../../../../root/.bashrc` to cause Incus to write outside of the `credentials` directory associated with the container. This makes use of the fact that the Incus syntax for such credentials is `systemd.credential.XYZ` where `XYZ` can itself contain more periods. While it's not possible to read any data this way, it's possible to write to arbitrary files as root, enabling both privilege escalation and denial of service attacks. Version 6.23.0 fixes the issue.", "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/33xxx/CVE-2026-33945.json" }, { "category": "description", "text": "Incus is a system container and virtual machine manager. Incus instances have an option to provide credentials to systemd in the guest. For containers, this is handled through a shared directory. Prior to version 6.23.0, an attacker can set a configuration key named something like `systemd.credential.../../../../../../root/.bashrc` to cause Incus to write outside of the `credentials` directory associated with the container. This makes use of the fact that the Incus syntax for such credentials is `systemd.credential.XYZ` where `XYZ` can itself contain more periods. While it's not possible to read any data this way, it's possible to write to arbitrary files as root, enabling both privilege escalation and denial of service attacks. Version 6.23.0 fixes the issue.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-33945" }, { "category": "description", "text": "Incus is a system container and virtual machine manager. Incus instances have an option to provide credentials to systemd in the guest. For containers, this is handled through a shared directory. Prior to version 6.23.0, an attacker can set a configuration key named something like `systemd.credential.../../../../../../root/.bashrc` to cause Incus to write outside of the `credentials` directory associated with the container. This makes use of the fact that the Incus syntax for such credentials is `systemd.credential.XYZ` where `XYZ` can itself contain more periods. While it's not possible to read any data this way, it's possible to write to arbitrary files as root, enabling both privilege escalation and denial of service attacks. Version 6.23.0 fixes the issue.", "title": "debian - https://security-tracker.debian.org/tracker/CVE-2026-33945" }, { "category": "description", "text": "A flaw was found in Incus, a system container and virtual machine manager. An attacker with the ability to configure Incus instances can exploit a path traversal vulnerability by manipulating the `systemd.credential` configuration key. This allows the attacker to write to arbitrary files as the root user, leading to both privilege escalation and denial of service within the system.\nCritical: A path traversal vulnerability in Incus allows an attacker with the ability to configure Incus instances to write to arbitrary files as the root user. This can lead to privilege escalation and denial of service within the system. This issue affects Incus, which is available as a community project.", "title": "redhat - https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-33945.json" }, { "category": "description", "text": "### Summary\nIncus instances have an option to provide credentials to systemd in the guest. For containers, this is handled through a shared directory.\nAn attacker can use the name of a systemd credential to escape that directory and overwrite arbitrary files on the host system.\n\nThis can in turn be used to perform local privilege escalation or cause a DoS.\n\n### Details\nAn attacker can set a configuration key named something like `systemd.credential.../../../../../../root/.bashrc` to cause Incus to write outside of the `credentials` directory associated with the container. This makes use of the fact that the Incus syntax for such credentials is `systemd.credential.XYZ` where `XYZ` can itself contain more periods.\n\nWhile it's not possible to read any data this way, it's possible to write to arbitrary files as root, enabling both privilege escalation and denial of service attacks.\n\n### Credit\nThis issue was discovered and reported by the team at [7asecurity](https://7asecurity.com/)", "title": "osv - https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Go%2FGHSA-q4q8-7f2j-9h9f.json?alt=media" }, { "category": "description", "text": "### Summary\nIncus instances have an option to provide credentials to systemd in the guest. For containers, this is handled through a shared directory.\nAn attacker can use the name of a systemd credential to escape that directory and overwrite arbitrary files on the host system.\n\nThis can in turn be used to perform local privilege escalation or cause a DoS.\n\n### Details\nAn attacker can set a configuration key named something like `systemd.credential.../../../../../../root/.bashrc` to cause Incus to write outside of the `credentials` directory associated with the container. This makes use of the fact that the Incus syntax for such credentials is `systemd.credential.XYZ` where `XYZ` can itself contain more periods.\n\nWhile it's not possible to read any data this way, it's possible to write to arbitrary files as root, enabling both privilege escalation and denial of service attacks.\n\n### Credit\nThis issue was discovered and reported by the team at [7asecurity](https://7asecurity.com/)", "title": "github - https://api.github.com/advisories/GHSA-q4q8-7f2j-9h9f" }, { "category": "other", "text": "0.00059", "title": "EPSS" }, { "category": "other", "text": "4.6", "title": "NCSC Score" }, { "category": "other", "text": "Is related to (a version of) an uncommon product", "title": "NCSC Score top decreasing factors" }, { "category": "details", "text": "Severity: 4\n", "title": "Vendor assessment" } ], "product_status": { "known_affected": [ "CSAFPID-5919453", "CSAFPID-2752898", "CSAFPID-5944290", "CSAFPID-5965579" ] }, "references": [ { "category": "external", "summary": "Source - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/33xxx/CVE-2026-33945.json" }, { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-33945" }, { "category": "external", "summary": "Source - debian", "url": "https://security-tracker.debian.org/tracker/CVE-2026-33945" }, { "category": "external", "summary": "Source - redhat", "url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-33945.json" }, { "category": "external", "summary": "Source - osv", "url": "https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Go%2FGHSA-q4q8-7f2j-9h9f.json?alt=media" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - github", "url": "https://api.github.com/advisories/GHSA-q4q8-7f2j-9h9f" }, { "category": "external", "summary": "Reference - cveprojectv5; github; nvd; osv; redhat", "url": "https://github.com/lxc/incus/security/advisories/GHSA-q4q8-7f2j-9h9f" }, { "category": "external", "summary": "Reference - redhat", "url": "https://www.cve.org/CVERecord?id=CVE-2026-33945" }, { "category": "external", "summary": "Reference - github; osv; redhat", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33945" }, { "category": "external", "summary": "Reference - github; osv", "url": "https://github.com/lxc/incus/commit/f74199f9983e2ce78f2b78b6d765c6635b229c82" }, { "category": "external", "summary": "Reference - github", "url": "https://github.com/advisories/GHSA-q4q8-7f2j-9h9f" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "baseScore": 9.9, "baseSeverity": "CRITICAL" }, "products": [ "CSAFPID-2752898", "CSAFPID-5919453", "CSAFPID-5944290", "CSAFPID-5965579" ] } ], "title": "CVE-2026-33945" } ] }