| Name | CVE-2026-58404 |
| Description | Hugo is a static site generator. From v0.162.0 through v0.163.0, the default security.http.urls policy denies requests to loopback, internal, and cloud-metadata IPv4 literals, but the deny rule only matched dotted-decimal notation, so alternate IPv4 encodings of the same addresses, including integer, hex, or octal, passed the policy. When a template passes an untrusted or data-derived URL to resources.GetRemote and the host platform uses the cgo system resolver, these encodings resolve to the blocked address, allowing build-time server-side requests to loopback and internal services, including the cloud-metadata endpoint in hosted or CI builds; the same check is reused on redirects, so the gap also applies to each redirect hop. This issue is fixed in v0.163.1. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 1141772 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| hugo (PTS) | bullseye | 0.80.0-6 | fixed |
| bullseye (security) | 0.80.0-6+deb11u1 | fixed | |
| bookworm | 0.111.3-1 | fixed | |
| trixie | 0.131.0-1 | fixed | |
| forky, sid | 0.162.1-7 | vulnerable |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| hugo | source | bullseye | (not affected) | |||
| hugo | source | bookworm | (not affected) | |||
| hugo | source | trixie | (not affected) | |||
| hugo | source | (unstable) | (unfixed) | 1141772 |
[trixie] - hugo <not-affected> (Vulnerable code introduced later)
[bookworm] - hugo <not-affected> (Alt-IPv4-encoding bypass of security.http.urls added in v0.162.0)
[bullseye] - hugo <not-affected> (Alt-IPv4-encoding bypass of security.http.urls added in v0.162.0)
https://github.com/gohugoio/hugo/security/advisories/GHSA-r46f-3rpw-hxrv
https://github.com/gohugoio/hugo/pull/15020
Introduced with: https://github.com/gohugoio/hugo/commit/62cef3678b219d0daf15dad040bd3df9384e5162 (v0.162.0)
Fixed by: https://github.com/gohugoio/hugo/commit/a00b5c72ac57afe26df6688ece3ca544a56df372 (v0.163.1)