---
id: CVE-2026-100693
title: >-
  Hugo versions from v0.162.0 before v0.166.0 contain a case-sensitive
  validation flaw in the security.http.urls IP-literal deny rule that allows
  attackers to bypass restrictions
summary: >-
  Hugo versions from v0.162.0 before v0.166.0 contain a case-sensitive
  validation flaw in the security.http.urls IP-literal deny rule that allows
  attackers to bypass restrictions. Attackers can use mixed-case URL schemes in
  resources.GetRe…
severity: high
cvss: 8.4
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-178
vendor: gohugoio
product: hugo
affected:
  - hugo >= 0.162.0 < 0.166.0
published: '2026-09-26'
updated: '2026-09-26'
sourceUpdated: '2026-09-26T14:16:54.007'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-100693'
references:
  - url: 'https://github.com/gohugoio/hugo/security/advisories/GHSA-pmrv-x7gp-2rjw'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/hugo-0.162.0-before-0.166.0-ip-literal-deny-rule-bypass
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-26T13:33:20.904Z'
---

## Overview

Hugo versions from v0.162.0 before v0.166.0 contain a case-sensitive validation flaw in the security.http.urls IP-literal deny rule that allows attackers to bypass restrictions. Attackers can use mixed-case URL schemes in resources.GetRemote calls to fetch from restricted IP addresses like localhost.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.