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.

INFO

Published Date :

2026-02-24T16:28:28.106Z

Last Modified :

2026-02-27T20:47:36.164Z

Source :

GitHub_M
AFFECTED PRODUCTS

The following products are affected by CVE-2026-27588 vulnerability.

Vendors Products
Caddyserver
  • Caddy
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-27588.

URL Resource
https://github.com/caddyserver/caddy/releases/tag/v2.11.1 cve-icon cve-icon
https://github.com/caddyserver/caddy/security/advisories/GHSA-x76f-jf84-rqj8 cve-icon cve-icon
Login to claim this CVE

CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Attack Requirements
Privileges Required
User Interaction
VS Confidentiality
VS Integrity
VS Availability
SS Confidentiality
SS Integrity
SS Availability
Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact