DEBIAN-CVE-2026-27588

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Source
https://security-tracker.debian.org/tracker/CVE-2026-27588
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-27588.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-27588
Upstream
Published
2026-02-24T17:29:04.163Z
Modified
2026-02-26T11:15:53.796257Z
Severity
  • 9.1 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS Calculator
Summary
[none]
Details

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.

References

Affected packages

Debian:12 / caddy

Package

Name
caddy
Purl
pkg:deb/debian/caddy?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.6.2-5
2.6.2-6
2.6.2-6.1
2.6.2-7
2.6.2-8
2.6.2-9
2.6.2-10
2.6.2-11
2.6.2-12
2.6.2-13
2.6.2-14

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-27588.json"

Debian:13 / caddy

Package

Name
caddy
Purl
pkg:deb/debian/caddy?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.6.2-12
2.6.2-13
2.6.2-14

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-27588.json"