Summary
Hugo: security.http.urls allow-list bypass via HTTP redirects
Commit: 86fbb0f7a8, security: Validate redirects against security.http.urls
Affected versions: v0.91.0 (when security.http.urls was introduced) through v0.161.1.
Fixed in: v0.162.0.
Severity: Only relevant for sites that rely on security.http.urls as a trust boundary, e.g. CI builds that fetch remote resources but want to constrain which hosts can be reached. Not an issue if you fully trust every URL passed to resources.GetRemote.
Description. resources.GetRemote enforces security.http.urls on the URL it is called with, but until v0.162.0 it did not re-validate intermediate URLs on HTTP 3xx redirects. An allowed server (or an attacker controlling its DNS or response) could therefore redirect the request to a host that the policy was meant to forbid, for example, http://localhost/ or an internal IP, and Hugo would fetch from the redirected target. The same bypass also lifted any host-shape restriction the operator had put in place.
Mitigation. v0.162.0 installs a CheckRedirect on the HTTP client used by resources.GetRemote that re-runs security.http.urls on every redirect target and caps the redirect chain at 10 hops. No configuration change is required.
Impact
Untrusted input controls the target URL of a server-initiated request, which may reach internal services not otherwise accessible from outside. Typical impact: access to internal metadata services, internal APIs, or cloud credentials.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
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Frequently Asked Questions
- What is CVE-2026-50134? CVE-2026-50134 is a medium-severity server-side request forgery (SSRF) vulnerability in github.com/gohugoio/hugo (go), affecting versions >= 0.91.0, < 0.162.0. It is fixed in 0.162.0. Untrusted input controls the target URL of a server-initiated request, which may reach internal services not otherwise accessible from outside.
- Which versions of github.com/gohugoio/hugo are affected by CVE-2026-50134? github.com/gohugoio/hugo (go) versions >= 0.91.0, < 0.162.0 is affected.
- Is there a fix for CVE-2026-50134? Yes. CVE-2026-50134 is fixed in 0.162.0. Upgrade to this version or later.
- Is CVE-2026-50134 exploitable, and should I be worried? Whether CVE-2026-50134 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether CVE-2026-50134 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix CVE-2026-50134? Upgrade
github.com/gohugoio/hugoto 0.162.0 or later.