{"id":"CVE-2026-50135","title":"Hugo: Symlink confinement bypass in resources.Get","summary":"Hugo: Symlink confinement bypass in resources.Get","severity":"medium","cwe":["CWE-59"],"vendor":"gohugoio","product":"github.com/gohugoio/hugo","ecosystem":"go","affected":["github.com/gohugoio/hugo >= 0.123.0, < 0.162.0"],"patched":["github.com/gohugoio/hugo 0.162.0"],"published":"2026-06-16","updated":"2026-06-16","source":"GHSA","sourceUrl":"https://github.com/advisories/GHSA-fw87-fv5r-9fpw","references":[{"url":"https://github.com/gohugoio/hugo/security/advisories/GHSA-fw87-fv5r-9fpw"},{"url":"https://github.com/gohugoio/hugo/commit/f8b5fa09a64950c32b803821ede411ebfe772b7a"},{"url":"https://github.com/gohugoio/hugo/releases/tag/v0.162.0"},{"url":"https://github.com/advisories/GHSA-fw87-fv5r-9fpw"}],"tags":["ghsa","go"],"ingestedAt":"2026-06-29T14:31:47.704Z","epss":0.00411,"epssPercentile":0.35086,"slug":"CVE-2026-50135","body":"## Overview\n\n**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.\n\n## Affected packages\n\n- `github.com/gohugoio/hugo >= 0.123.0, < 0.162.0`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `github.com/gohugoio/hugo 0.162.0`","depth":"sunlit","depthScore":28,"depthScoreParts":{"impact":27.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}