Hugo is a static site generator. From v0.123.0 through v0.163.0, Hugo's virtual filesystem is designed so that files under a mount cannot reach outside the mount tree, but a regression 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. This issue is fixed in v0.163.1.
Fix
Patch, vendor advisory and mitigation references on NVD 2
- https://github.com/gohugoio/hugo/commit/cf9c8f93ca2a2838ce378f9e36d052ac2f79e229 Patch
- https://github.com/gohugoio/hugo/security/advisories/GHSA-c3wq-j5vh-68rc Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 5.9 · gohugoNVD modified 2026-10-25 20:10
Affected (CPE criteria) 1
cpe:2.3:a:gohugo:hugo:*:*:*:*:*:*:*:*
References 4
- https://github.com/gohugoio/hugo/commit/cf9c8f93ca2a2838ce378f9e36d052ac2f79e229 Patch
- https://github.com/gohugoio/hugo/pull/15020 Issue Tracking
- https://github.com/gohugoio/hugo/releases/tag/v0.163.1 Release Notes
- https://github.com/gohugoio/hugo/security/advisories/GHSA-c3wq-j5vh-68rc Vendor Advisory