CVE-2026-100693
Received Received - Intake

Hugo Security Bypass via Mixed-Case URL Scheme in resources.GetRemote

Publication date: 2026-09-26

Last updated on: 2026-09-26

Assigner: VulnCheck

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 Scores

EPSS Scores

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Meta Information

Published
2026-09-26
Last Modified
2026-09-26
Generated
2026-09-26
AI Q&A
2026-09-26
EPSS Evaluated
N/A
NVD
CVE-2026-100693
EUVD
EUVD-2026-87666

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
gohugoio hugo From 0.162.0 (inc) to 0.166.0 (exc)

Helpful Resources

Exploitability

CWE
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KEV
KEV Icon
CWE ID Description
CWE-178 The product does not properly account for differences in case sensitivity when accessing or determining the properties of a resource, leading to inconsistent results.

Attack-Flow Graph

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Executive Summary

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

Detection Guidance

Check Hugo version with 'hugo version' to see if it falls between v0.162.0 and v0.165.x. Inspect network logs for resources.GetRemote calls using mixed-case URL schemes like 'HTTP://127.0.0.1/' or similar bypass attempts.

Impact Analysis

This vulnerability allows attackers to bypass IP restrictions and access restricted resources like localhost. It could lead to unauthorized data access or remote code execution if exploited. The high CVSS score indicates significant impact on confidentiality, integrity, and availability.

Mitigation Strategies

Upgrade Hugo to v0.166.0 or later immediately. If upgrading is not possible, tighten the security.http.urls allowlist to explicitly block all IP-literal formats including mixed-case schemes.

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