CVE-2026-100693: Improper Handling of Case Sensitivity in gohugoio hugo
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.
AI Analysis
Technical Summary
Hugo versions >=0.162.0 and <0.166.0 contain a vulnerability where the security.http.urls IP-literal deny rule does not properly handle case sensitivity. This flaw allows attackers to bypass restrictions by using mixed-case URL schemes in resources.GetRemote calls, potentially fetching resources from restricted IP addresses like localhost.
Potential Impact
Attackers can bypass IP-literal deny rules designed to restrict access to certain IP addresses, including localhost. This could lead to unauthorized access to internal network resources or services that should be protected by these restrictions.
Mitigation Recommendations
A fix is available in Hugo versions 0.166.0 and later. Users should upgrade to version 0.166.0 or newer to remediate this vulnerability.
CVE-2026-100693: Improper Handling of Case Sensitivity in gohugoio hugo
Description
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.
CVSS v4.0
Score 8.6high
Affected software
gohugoio
hugo
pkg:golang/github.com/gohugoio/hugoRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Hugo versions >=0.162.0 and <0.166.0 contain a vulnerability where the security.http.urls IP-literal deny rule does not properly handle case sensitivity. This flaw allows attackers to bypass restrictions by using mixed-case URL schemes in resources.GetRemote calls, potentially fetching resources from restricted IP addresses like localhost.
Potential Impact
Attackers can bypass IP-literal deny rules designed to restrict access to certain IP addresses, including localhost. This could lead to unauthorized access to internal network resources or services that should be protected by these restrictions.
Mitigation Recommendations
A fix is available in Hugo versions 0.166.0 and later. Users should upgrade to version 0.166.0 or newer to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-09-26T02:37:41.037Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ab7c9adf7a7c5410652fd5c
Added to database: 09/26/2026, 13:33:33 UTC
Last enriched: 09/26/2026, 13:47:38 UTC
Last updated: 09/27/2026, 04:31:23 UTC
Views: 15
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