GHSA-fw87-fv5r-9fpw

Source

https://github.com/advisories/GHSA-fw87-fv5r-9fpw

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-fw87-fv5r-9fpw/GHSA-fw87-fv5r-9fpw.json

JSON Data

https://api.test.osv.dev/v1/vulns/GHSA-fw87-fv5r-9fpw

Aliases

Published

2026-06-16T20:12:34Z

Modified

2026-07-07T20:41:30Z

Severity

6.9 (Medium) CVSS_V4 - 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 CVSS Calculator

Summary

Hugo: Symlink confinement bypass in resources.Get

Details

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.

Database specific

{
    "cwe_ids":  [
        "CWE-59"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-06-16T20:12:34Z",
    "nvd_published_at":  null,
    "severity":  "MODERATE"
}

References

Affected packages

Go / github.com/gohugoio/hugo

Package

Name: github.com/gohugoio/hugo; View open source insights on deps.dev
Purl: pkg:golang/github.com/gohugoio/hugo

Affected 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"