Web Application Vulnerabilities Runtime SCA Findings
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Caddy Web Server Improper Handling of Case Sensitivity Vulnerability - CVE-2026-27588 - Vulnerability Database
Caddy Web Server

Caddy Web Server Improper Handling of Case Sensitivity Vulnerability - CVE-2026-27588

Critical
Reference: CVE-2026-27588
NVD Link: https://nvd.nist.gov/vuln/detail/CVE-2026-27588
Title: Caddy Web Server Improper Handling of Case Sensitivity Vulnerability
Overview:

Caddy is an extensible server platform that uses TLS by default. Prior to version 2.11.1 Caddy39s HTTP host request matcher is documented as case-insensitive but when configured with a large host list (gt100 entries) it becomes case-sensitive due to an optimized matching path. An attacker can bypass host-based routing and any access controls attached to that route by changing the casing of the Host header. Version 2.11.1 contains a fix for the issue.