Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Gohugo | Hugo | >= 0.162.0, < 0.163.1 |
Related Weaknesses (CWE)
References
- https://github.com/gohugoio/hugo/commit/a00b5c72ac57afe26df6688ece3ca544a56df372Patch
- https://github.com/gohugoio/hugo/pull/15020Issue Tracking
- https://github.com/gohugoio/hugo/releases/tag/v0.163.1Release Notes
- https://github.com/gohugoio/hugo/security/advisories/GHSA-r46f-3rpw-hxrvMitigationVendor Advisory
FAQ
What is CVE-2026-58404?
CVE-2026-58404 is a vulnerability with a CVSS score of 6.8 (MEDIUM). 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 m...
How severe is CVE-2026-58404?
CVE-2026-58404 has been rated MEDIUM with a CVSS base score of 6.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-58404?
Check the references section above for vendor advisories and patch information. Affected products include: Gohugo Hugo.