gohugoio Hugo up to 0.163.0 Security HTTP URLs server-side request forgery

Summaryinfo

A vulnerability categorized as problematic has been discovered in gohugoio Hugo up to 0.163.0. This affects an unknown part of the component Security HTTP URLs. Executing a manipulation can lead to server-side request forgery. This vulnerability is registered as CVE-2026-58404. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability has been found in gohugoio Hugo up to 0.163.0 and classified as problematic. This vulnerability affects an unknown functionality of the component Security HTTP URLs. The manipulation with an unknown input leads to a server-side request forgery vulnerability. The CWE definition for the vulnerability is CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. As an impact it is known to affect confidentiality. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability was named CVE-2026-58404 since 06/30/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available.

Upgrading to version 0.163.1 eliminates this vulnerability.

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Productinfo

Vendor

• gohugoio

Name

• Hugo

Version

• 0.163

Website

• Product: https://github.com/gohugoio/hugo/

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