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EUVD-2026-333534

fkie_cve-2026-58403

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.

GHSA-c3wq-j5vh-68rc — Hugo: Symlink confinement bypass in os.ReadFile

Affected: Go: github.com/gohugoio/hugo

**Affected versions:** v0.123.0 through v0.163.0. Earlier versions are not affected. **Fixed in:** v0.163.1. **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 `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`.

RHSA-2026:36862 — Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

github.com/gohugoio/hugo: Hugo: Cross-site Scripting via untrusted HTML content files github.com/gohugoio/hugo: Hugo: Cross-site Scripting via unescaped code-fence language in default code block renderer github.com/gohugoio/hugo: Hugo: Information disclosure via symlink confinement bypass in virtual filesystem github.com/gohugoio/hugo: Hugo: Server-Side Request Forgery (SSRF) via alternate IPv4 encodings

UBUNTU-CVE-2026-58403

Affected: Ubuntu:16.04:LTS: hugo, Ubuntu:18.04:LTS: hugo, Ubuntu:20.04:LTS: hugo, Ubuntu:22.04:LTS: hugo, Ubuntu:Pro:24.04:LTS: hugo, Ubuntu:25.10: hugo, Ubuntu:26.04:LTS: hugo