CVE-2026-27588 - Caddy: MatchHost becomes case-sensitive for large host lists (>100), enabling ho...

CVE ID : CVE-2026-27588 Published : Feb. 24, 2026, 5:29 p.m. | 1 hour, 3 minutes ago Description : Caddy is an extensible server platform that uses TLS by default. Prior to version 2.11.1, Caddy's HTTP `host` request matcher is documented as case-insensitive, but when configured with a large host list (>100 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. Severity: 7.7 | HIGH Visit the link for more details, such as CVSS details, affected products, timeline, and more...