CVE-2026-58404: Gohugo Hugo

Medium severity, CVSS 6.8. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Gohugo Hugo: from 0.162.0, before 0.163.1 (fixed in 0.163.1)

Published 2026-07-06. Last modified 2026-07-08.