{"id":"CVE-2025-54867","aliases":["EUVD-2025-24859","GHSA-j26p-6wx7-f3pw"],"status":"published","title":"Youki Symlink Following Vulnerability","description":"Youki is a container runtime written in Rust. Prior to version 0.5.5, if /proc and /sys in the rootfs are symbolic links, they can potentially be exploited to gain access to the host root filesystem. This issue has been patched in version 0.5.5.","severity":{"version":"3.1","score":7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00194,"percentile":0.09131,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-61"],"published":"2025-08-14T16:08:00Z","modified":"2026-10-28T02:30:36Z","fixes":[{"ecosystem":"crates.io","package":"youki","fixed_in":["0.5.5"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"crates.io","package":"youki","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.5.5"}]}]},{"source":"osv","ecosystem":"crates.io","package":"youki","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.5.5"}]}]}],"products":[{"vendor":"youki-dev","product":"youki"}],"references":[{"url":"https://github.com/youki-dev/youki/security/advisories/GHSA-j26p-6wx7-f3pw","tags":["x_refsource_CONFIRM","Vendor Advisory","advisory","web"]},{"url":"https://github.com/youki-dev/youki/commit/0d9b4f2aa5ceaf988f3eb568711d2acf0a4ace37","tags":["x_refsource_MISC","Patch","fix","web"]},{"url":"https://github.com/youki-dev/youki/releases/tag/v0.5.5","tags":["x_refsource_MISC","Release Notes","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-54867","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-j26p-6wx7-f3pw"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/54xxx/CVE-2025-54867.json","tags":["advisory"]},{"url":"https://github.com/youki-dev/youki","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2025-54867","title":"Youki Symlink Following Vulnerability","description":"Youki is a container runtime written in Rust. Prior to version 0.5.5, if /proc and /sys in the rootfs are symbolic links, they can potentially be exploited to gain access to the host root filesystem. This issue has been patched in version 0.5.5.","status":"published","published":"2025-08-14T16:08:00.622Z","modified":"2025-08-14T19:26:11.541Z","cvss":[{"version":"3.1","score":7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-61"],"updated_at":"2026-11-02T14:32:27.603809Z"}],"euvd":[{"id":"EUVD-2025-24859","description":"Youki is a container runtime written in Rust. Prior to version 0.5.5, if /proc and /sys in the rootfs are symbolic links, they can potentially be exploited to gain access to the host root filesystem. This issue has been patched in version 0.5.5.","status":"published","published":"2025-08-14T16:08:00Z","modified":"2025-08-14T19:26:11Z","cvss":[{"version":"3.1","score":7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T20:31:57.477883Z"}],"ghsa":[{"id":"GHSA-j26p-6wx7-f3pw","title":"Youki: If /proc and /sys in the rootfs are symbolic links, they can potentially be exploited to gain access to the host root filesystem.","description":"### 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","status":"published","published":"2025-08-14T16:39:04Z","modified":"2025-08-14T19:37:23Z","cvss":[{"version":"3.1","score":7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-61"],"updated_at":"2026-11-02T14:38:53.767052Z"}],"nvd":[{"id":"CVE-2025-54867","description":"Youki is a container runtime written in Rust. Prior to version 0.5.5, if /proc and /sys in the rootfs are symbolic links, they can potentially be exploited to gain access to the host root filesystem. This issue has been patched in version 0.5.5.","status":"published","published":"2025-08-14T16:15:39.933Z","modified":"2026-06-17T09:40:49.94Z","cvss":[{"version":"3.1","score":7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-61"],"updated_at":"2026-11-02T14:11:23.594522Z"}],"osv":[{"id":"CVE-2025-54867","title":"Youki Symlink Following Vulnerability","description":"Youki is a container runtime written in Rust. Prior to version 0.5.5, if /proc and /sys in the rootfs are symbolic links, they can potentially be exploited to gain access to the host root filesystem. This issue has been patched in version 0.5.5.","status":"published","published":"2025-08-14T16:08:00.622Z","modified":"2026-10-28T02:30:36.447146537Z","cvss":[{"version":"3.1","score":7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-61"],"updated_at":"2026-11-02T15:44:50.863921Z"},{"id":"GHSA-j26p-6wx7-f3pw","title":"Youki: If /proc and /sys in the rootfs are symbolic links, they can potentially be exploited to gain access to the host root filesystem.","description":"### 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","status":"published","published":"2025-08-14T16:39:04Z","modified":"2025-08-14T19:37:22Z","cvss":[{"version":"3.1","score":7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-61"],"updated_at":"2026-11-02T15:46:49.621585Z"}]}}