PT-2026-55981 · Gohugoio · Hugo

Vnth4Nhnt · Published 2026-07-06 · Updated 2026-07-06 · CVE-2026-58404

Mitre

CVSS v4.0

4.6

Medium

Base vector

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

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.

Fix

SSRF

Weakness Enumeration

CWE-918

Related Identifiers

CVE-2026-58404

Affected Products

Hugo

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-58404 · Security Note
• https://github.com/gohugoio/hugo/pull/15020 · Note
• https://github.com/gohugoio/hugo/commit/a00b5c72ac57afe26df6688ece3ca544a56df372 · Note
• https://github.com/gohugoio/hugo/releases/tag/v0.163.1 · Note
• https://github.com/gohugoio/hugo/security/advisories/GHSA-r46f-3rpw-hxrv · Note