CVE-2026-50134: Hugo Security.http.urls Allow-list Bypass Vulnerability

MODERATE
Advisory Identifier: GHSA-vxgm-5rmg-5w8g
Share
CWE-918
Published
Advisory Summary

CVE-2026-50134 is a MODERATE security.http.urls allow-list bypass vulnerability (CWE-918: Server-Side Request Forgery (SSRF)) affecting Hugo libraries in the Go ecosystem. The issue involves security.http.urls allow-list bypass via http redirects. Remediation is available by upgrading affected packages to version 0.162.0.

CVE-2026-50134 at a Glance

CVE Identifier CVE-2026-50134
GHSA Identifier GHSA-vxgm-5rmg-5w8g
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-918: Server-Side Request Forgery (SSRF)
Affected Product Hugo
Package Ecosystem Go
Published Date
Last Updated

How to Fix CVE-2026-50134

To remediate this vulnerability, upgrade all affected Hugo dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

github.com/gohugoio/hugo fixed: 0.162.0 
Upgrade github.com/gohugoio/hugo to 0.162.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for github.com/gohugoio/hugo

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-50134, inspect your project dependencies for Hugo:

inspect dependencies for github.com/gohugoio/hugo

Analyze the terminal output to locate any version of Hugo in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.162.0), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-918: Server-Side Request Forgery (SSRF), where 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. In Hugo, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

**Commit:** [86fbb0f7a8](https://github.com/gohugoio/hugo/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.

CVE-2026-50134 Affected Hugo Versions

1 component(s)
Fixed Versions:
0.162.0
Product / Package Ecosystem Affected Versions Fixed Version
github.com/gohugoio/hugo
golang/github.com/gohugoio/hugo
Go
≥ 0.91.0
< 0.162.0
0.162.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/gohugoio/hugo/security/advisories/GHSA-vxgm-5rmg-5w8g
Security Fix Commit FIX COMMIT
https://github.com/gohugoio/hugo/commit/86fbb0f7a8bbb93e2e916390de9e5a4f24bf9f50
Hugo Source Repository REPOSITORY
https://github.com/gohugoio/hugo
Hugo Release RELEASE
https://github.com/gohugoio/hugo/releases/tag/v0.162.0

Frequently Asked Questions

What is CVE-2026-50134?
CVE-2026-50134 is a security vulnerability in Hugo involving security.http.urls allow-list bypass via HTTP redirects under CWE-918: Server-Side Request Forgery (SSRF).
Which Hugo versions are affected?
Affected versions include releases prior to 0.162.0 across affected packages: github.com/gohugoio/hugo.
What version fixes CVE-2026-50134?
Upgrading to 0.162.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/gohugoio/hugo affected?
Yes, github.com/gohugoio/hugo is affected in releases prior to 0.162.0. Upgrade your dependency to 0.162.0 or later.
What CWE is associated with CVE-2026-50134?
CVE-2026-50134 is classified under CWE-918: Server-Side Request Forgery (SSRF) (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.).
How can I check Go dependencies for CVE-2026-50134?
Run the dependency tree command: 'inspect dependencies for github.com/gohugoio/hugo'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-vxgm-5rmg-5w8g",
  "modified" : "2026-06-16T19:22:37Z",
  "published" : "2026-06-16T19:22:37Z",
  "aliases" : [ "CVE-2026-50134" ],
  "summary" : "Hugo: security.http.urls allow-list bypass via HTTP redirects",
  "details" : "**Commit:** [86fbb0f7a8](https://github.com/gohugoio/hugo/commit/86fbb0f7a8) — _security: Validate redirects against security.http.urls_\n**Affected versions:** v0.91.0 (when `security.http.urls` was introduced) through v0.161.1.\n**Fixed in:** v0.162.0.\n**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`.\n\n**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.\n\n**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.",
  "severity" : [ ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/gohugoio/hugo"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0.91.0"
      }, {
        "fixed" : "0.162.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/gohugoio/hugo/security/advisories/GHSA-vxgm-5rmg-5w8g"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/gohugoio/hugo/commit/86fbb0f7a8bbb93e2e916390de9e5a4f24bf9f50"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/gohugoio/hugo"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/gohugoio/hugo/releases/tag/v0.162.0"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-918" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-06-16T19:22:37Z",
    "nvd_published_at" : null
  }
}