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CVE-2026-27588

🚨 CRITICAL

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 l...

Published
Feb 24, 2026
Last Modified
Feb 25, 2026
Views
2
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Description

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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.

Affected Products (1)

caddyserver - caddy

Version: *

CVSS Scores

CVSS 3.1 9.1
9.1
CRITICAL
CVSS 2.0 9.1

References

github.com github.com

Additional Information

Source
security-advisories@github.com
State
Analyzed

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