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Vulnerability record · CVE-2026-100693 · published 26 September 2026

CVE-2026-100693: Hugo versions from v0.162.0 before v0.166.0 contain a case-sensitive validation flaw in the security.http.urls…

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.

8.6 CVSS 4.0 High EPSS 0.13% · top 97.8% CWE-178 · CWE-178 Received
8.6CVSS 4.0 base score
0.13%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
26 Sep 2026Last modified by NVD

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:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/gohugoio/hugo/security/advisories/GHSA-pmrv-x7gp-2rjw
https://www.vulncheck.com/advisories/hugo-0.162.0-before-0.166.0-ip-literal-deny-rule-bypass

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2020-12812FortiOS SSL VPN two-factor authentication bypass via username case changeFortiOS SSL VPN fails to enforce the second authentication factor (FortiToken) when a user alters the letter case of their username. Because the user…KEVEPSS 49%analysed

Source: NIST National Vulnerability Database (record CVE-2026-100693), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.