Case-Sensitive Validation Flaw in Hugo by GoHugo
CVE-2026-100693

8.6HIGH

Key Information:

Vendor

Gohugoio

Status
Hugo
Vendor
CVE Published:
26 September 2026

What is CVE-2026-100693?

Hugo versions from v0.162.0 before v0.166.0 exhibit a case-sensitive validation issue within the security.http.urls IP-literal deny rule. This vulnerability allows attackers to exploit mixed-case URL schemes in resources.GetRemote calls, permitting access to restricted IP addresses, including localhost. By leveraging this flaw, unauthorized users may effectively bypass security restrictions, posing potential threats to sensitive data and system integrity.

Affected Version(s)

hugo 0.162.0 < 0.166.0

hugo 0.166.0

References

https://github.com/gohugoio/hugo/security/advisories/GHSA...
vendor-advisory
https://www.vulncheck.com/advisories/hugo-0.162.0-before-...
third-party-advisory

CVSS V4

Score:
8.6
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Reload3d
.