{"id":"CVE-2026-50135","aliases":["GHSA-fw87-fv5r-9fpw","GO-2026-5380"],"url":"https://o3.security/vulnerability/CVE-2026-50135","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.","published":"2026-07-06T19:52:04.561Z","modified":"2026-10-28T02:30:39.216602445Z","cvss":null,"epss":{"score":0.00271,"percentile":0.19489,"asOf":"2026-08-23"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/gohugoio/hugo","fixedVersion":"0.162.0"}],"fix":{"url":"https://github.com/gohugoio/hugo/commit/f8b5fa09a64950c32b803821ede411ebfe772b7a","label":"gohugoio/hugo@f8b5fa0"},"references":[{"type":"WEB","url":"https://github.com/gohugoio/hugo/releases/tag/v0.162.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/50xxx/CVE-2026-50135.json"},{"type":"ADVISORY","url":"https://github.com/gohugoio/hugo/security/advisories/GHSA-fw87-fv5r-9fpw"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50135"},{"type":"FIX","url":"https://github.com/gohugoio/hugo/commit/f8b5fa09a64950c32b803821ede411ebfe772b7a"},{"type":"PACKAGE","url":"https://github.com/gohugoio/hugo"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-28T02:30:39.216602445Z"}}