{"id":"GHSA-fw87-fv5r-9fpw","summary":"Hugo: Symlink confinement bypass in resources.Get","details":"**Commit:** [f8b5fa09a6](https://github.com/gohugoio/hugo/commit/f8b5fa09a6) — _Fix prevention of direct symlink reads in resources.Get_\n**Affected versions:** v0.123.0 through v0.161.1. Earlier versions are not affected.\n**Fixed in:** v0.162.0.\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 `resources.Get \"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`.\n\n**Mitigation.** v0.162.0 calls `LstatIfPossible` and rejects symlinked entries with `os.ErrNotExist`, matching the behaviour of pre-v0.123.0 releases and of the directory-walking code paths.","aliases":["CVE-2026-50135","GO-2026-5380"],"modified":"2026-07-07T20:41:30.453694525Z","published":"2026-06-16T20:12:34Z","database_specific":{"github_reviewed":true,"github_reviewed_at":"2026-06-16T20:12:34Z","nvd_published_at":null,"cwe_ids":["CWE-59"],"severity":"MODERATE"},"references":[{"type":"WEB","url":"https://github.com/gohugoio/hugo/security/advisories/GHSA-fw87-fv5r-9fpw"},{"type":"WEB","url":"https://github.com/gohugoio/hugo/commit/f8b5fa09a64950c32b803821ede411ebfe772b7a"},{"type":"PACKAGE","url":"https://github.com/gohugoio/hugo"},{"type":"WEB","url":"https://github.com/gohugoio/hugo/releases/tag/v0.162.0"}],"affected":[{"package":{"name":"github.com/gohugoio/hugo","ecosystem":"Go","purl":"pkg:golang/github.com/gohugoio/hugo"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0.123.0"},{"fixed":"0.162.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-fw87-fv5r-9fpw/GHSA-fw87-fv5r-9fpw.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"}]}