CVE-2026-27588 - Vulnerability Analysis

Overview

Caddy < 2.11.1 contains a host header case sensitivity issue caused by an optimized matching path with large host lists, letting attackers bypass host-based routing and access controls by changing Host header casing.

Severity & Score

Impact

Attackers can bypass host-based routing and access controls, potentially accessing unauthorized resources.

Mitigation

Update to version 2.11.1 or later.

References

• https://github.com/caddyserver/caddy/releases/tag/v2.11.1
• https://github.com/caddyserver/caddy/security/advisories/GHSA-x76f-jf84-rqj8

Related Resources

• Vulnerability Intelligence Dashboard
• Credential Scanner