PT-2026-50158 · Go · Github.Com/Gohugoio/Hugo

Published 2026-06-16 · Updated 2026-06-16 · CVE-2026-50135

OSV

CVSS v4.0

6.9

Medium

Base vector

AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Commit: f8b5fa09a6 — Fix prevention of direct symlink reads in resources.Get Affected versions: v0.123.0 through v0.161.1. Earlier versions are not affected. Fixed in: v0.162.0. 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.

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.

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.

Fix

Link Following

Weakness Enumeration

CWE-59

Related Identifiers

CVE-2026-50135

GHSA-FW87-FV5R-9FPW

Affected Products

Github.Com/Gohugoio/Hugo

References · 5

• https://osv.dev/vulnerability/GHSA-fw87-fv5r-9fpw · Vendor Advisory
• https://github.com/gohugoio/hugo/releases/tag/v0.162.0 · Note
• https://github.com/gohugoio/hugo · Note
• https://github.com/gohugoio/hugo/security/advisories/GHSA-fw87-fv5r-9fpw · Note
• https://github.com/gohugoio/hugo/commit/f8b5fa09a64950c32b803821ede411ebfe772b7a · Note