ByteOS Network

CVE Vulnerability Details :

CVE-2026-27588

PUBLISHED

More Info Official Page

Assigner-GitHub_M

Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa

Published At-24 Feb, 2026 | 16:28

Updated At-24 Feb, 2026 | 16:28

▼CVE Numbering Authority (CNA)

Caddy: MatchHost becomes case-sensitive for large host lists (>100), enabling host-based route/auth bypass

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

Vendor

caddyserver

Product

caddy

Versions

Affected

< 2.11.1

Problem Types

Type	CWE ID	Description
CWE	CWE-178	CWE-178: Improper Handling of Case Sensitivity

Type: CWE

CWE ID: CWE-178

Description: CWE-178: Improper Handling of Case Sensitivity

Metrics

Version	Base score	Base severity	Vector
4.0	7.7	HIGH	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P

Version: 4.0

Base score: 7.7

Base severity: HIGH

Vector:

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P

References

Hyperlink	Resource
https://github.com/caddyserver/caddy/security/advisories/GHSA-x76f-jf84-rqj8	x_refsource_CONFIRM
https://github.com/caddyserver/caddy/releases/tag/v2.11.1	x_refsource_MISC

Hyperlink: https://github.com/caddyserver/caddy/security/advisories/GHSA-x76f-jf84-rqj8

Resource:

x_refsource_CONFIRM

Hyperlink: https://github.com/caddyserver/caddy/releases/tag/v2.11.1

Resource:

x_refsource_MISC

Affected Products

Affected

Problem Types

Metrics

Metrics Other Info

Impacts

Solutions

Configurations

Workarounds

Exploits

Credits

Timeline

Replaced By

Rejected Reason

References