{"id":"GHSA-4g74-7cff-xcv8","revision":"6a9ca0e488814f6da0524c91ce61d3b9","records":[{"revision":"6a9ca0e488814f6da0524c91ce61d3b9","observedAt":"2026-10-24T13:19:54.901+00:00","statement":{"source":"osv","id":"GHSA-4g74-7cff-xcv8","aliases":["CVE-2025-62161"],"title":"youki container escape via \"masked path\" abuse due to mount race conditions","description":"### Impact ###\n\nyouki utilizes bind mounting the container's `/dev/null` as a file mask. When performing this operation, the initial validation of the source `/dev/null` was insufficient. Specifically, we initially failed to verify whether `/dev/null` was genuinely present. However, we did perform validation to ensure that the `/dev/null` path existed within the container, including checking for symbolic links. Additionally, there was a vulnerability in the timing between validation and the actual mount operation.\n\nAs a result, by replacing `/dev/null` with a symbolic link, we can bind-mount arbitrary files from the host system.\n\nThis is a different project, but the core logic is similar to the CVE in runc. Issues were identified in runc, and verification was also conducted in youki to confirm the problems.\nhttps://github.com/opencontainers/runc/security/advisories/GHSA-9493-h29p-rfm2\n\n### Credits\n\nThanks to Lei Wang (@ssst0n3 from Huawei) for finding and reporting the original runc's vulnerability (Attack 1), and Li Fubang (@lifubang from acmcoder.com, CIIC) for discovering another attack vector in runc (Attack 2) based on @ssst0n3's initial findings.\n\nAlso, @cyphar helped youki in finding the problem.","state":0,"publishedAt":"2025-11-05T18:44:18+00:00","modifiedAt":"2025-11-15T02:25:02+00:00","affected":[{"ecosystem":"crates.io","name":"youki","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"0.5.7"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","score":null,"severity":null},{"system":"CVSS_V4","vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/opencontainers/runc/security/advisories/GHSA-9493-h29p-rfm2","https://github.com/youki-dev/youki/security/advisories/GHSA-4g74-7cff-xcv8","https://nvd.nist.gov/vuln/detail/CVE-2025-62161","https://github.com/youki-dev/youki/commit/5886c91073b9be748bd8d5aed49c4a820548030a","https://github.com/youki-dev/youki"],"sourceUrl":"https://github.com/advisories/GHSA-4g74-7cff-xcv8","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-4g74-7cff-xcv8","identifiers":["GHSA-4g74-7cff-xcv8","CVE-2025-62161"]},"retained":false,"historicalAffected":[]}],"coverage":[]}