{"id":"GHSA-c3wq-j5vh-68rc","revision":"4acca5667e114e449be4a90d9d644bfc","records":[{"revision":"4acca5667e114e449be4a90d9d644bfc","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-c3wq-j5vh-68rc","aliases":["CVE-2026-58403","GO-2026-5309"],"title":"Hugo: Symlink confinement bypass in os.ReadFile","description":"**Affected versions:** v0.123.0 through v0.163.0. Earlier versions are not affected.\n**Fixed in:** v0.163.1.\n**Severity:** Medium. Requires the attacker to be able to place (or convince a site author to place) a symlink inside a mounted directory — for example, inside a locally-vendored theme under `themes/`. Themes mounted as Go modules from GitHub have symlinks stripped on download and are not affected. Multi-directory walks (e.g. content/asset walking) were not affected either; only direct lookups via `resources.Get` followed symlinks.\n\n**Description.** Hugo's virtual filesystem is designed so that files under a mount cannot reach outside the mount tree. A regression introduced in v0.123.0 caused `RootMappingFs.statRoot` to call `Stat` (which follows symlinks) instead of `Lstat`, so a direct `os.ReadFile \"somefile\"` where `somefile` was a symlink pointing outside the mount would return the target's contents. This effectively let a symlink planted inside a theme or local mount read arbitrary files reachable to the user running `hugo`.","state":0,"publishedAt":"2026-06-19T17:45:38+00:00","modifiedAt":"2026-07-24T19:11:41.3478888+00:00","affected":[{"ecosystem":"Go","name":"github.com/gohugoio/hugo","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0.123.0"},{"kind":"fixed","version":"0.163.1"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V4","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/gohugoio/hugo/security/advisories/GHSA-c3wq-j5vh-68rc","https://github.com/gohugoio/hugo"],"sourceUrl":"https://github.com/advisories/GHSA-c3wq-j5vh-68rc","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-c3wq-j5vh-68rc","identifiers":["GHSA-c3wq-j5vh-68rc","CVE-2026-58403","GO-2026-5309"]},"retained":false,"historicalAffected":[]}],"coverage":[]}