{"id":"CVE-2025-54867","aliases":["GHSA-j26p-6wx7-f3pw"],"url":"https://o3.security/vulnerability/CVE-2025-54867","summary":"Youki Symlink Following Vulnerability","details":"### Summary\nIf `/proc` and `/sys` in the rootfs are symbolic links, they can potentially be exploited to gain access to the host root filesystem.\n\n### Details\n\nFor security reasons, container creation should be prohibited if `/proc` or `/sys` in the rootfs is a symbolic link.\nI verified this behavior with `youki`.\nWhen `/proc` or `/sys` is a symbolic link, `runc` fails to create the container, whereas `youki` successfully creates it.\n\nThis is the fix related to this issue in `runc`.\n* https://github.com/opencontainers/runc/pull/3756\n* https://github.com/opencontainers/runc/pull/3773\n* https://github.com/opencontainers/runc/blob/main/libcontainer/rootfs_linux.go#L590\n* https://github.com/opencontainers/runc/blob/main/tests/integration/mask.bats#L60\n\n\n### Impact\n\nThe following advisory appears to be related to this vulnerability:\n* https://github.com/advisories/GHSA-vpvm-3wq2-2wvm\n* https://github.com/advisories/GHSA-fh74-hm69-rqjw","published":"2025-08-14T16:08:00.622Z","modified":"2026-10-28T02:30:36.447146537Z","cvss":{"score":7,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"crates.io","name":"youki","fixedVersion":"0.5.5"}],"fix":{"url":"https://github.com/youki-dev/youki/commit/0d9b4f2aa5ceaf988f3eb568711d2acf0a4ace37","label":"youki-dev/youki@0d9b4f2"},"references":[{"type":"WEB","url":"https://github.com/youki-dev/youki/releases/tag/v0.5.5"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/54xxx/CVE-2025-54867.json"},{"type":"ADVISORY","url":"https://github.com/youki-dev/youki/security/advisories/GHSA-j26p-6wx7-f3pw"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-54867"},{"type":"FIX","url":"https://github.com/youki-dev/youki/commit/0d9b4f2aa5ceaf988f3eb568711d2acf0a4ace37"},{"type":"PACKAGE","url":"https://github.com/youki-dev/youki"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-28T02:30:36.447146537Z"}}