DEBIAN-CVE-2026-27586

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Source

https://security-tracker.debian.org/tracker/CVE-2026-27586

Import Source

https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-27586.json

JSON Data

https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-27586

Upstream

CVE-2026-27586

Published

2026-02-24T17:29:03.793Z

Modified

2026-02-26T11:15:52.985269Z

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, two swallowed errors in ClientAuthentication.provision() cause mTLS client certificate authentication to silently fail open when a CA certificate file is missing, unreadable, or malformed. The server starts without error but accepts any client certificate signed by any system-trusted CA, completely bypassing the intended private CA trust boundary. Any deployment using trusted_ca_cert_file or trusted_ca_certs_pem_files for mTLS will silently degrade to accepting any system-trusted client certificate if the CA file becomes unavailable. This can happen due to a typo in the path, file rotation, corruption, or permission changes. The server gives no indication that mTLS is misconfigured. Version 2.11.1 fixes the vulnerability.

References

https://security-tracker.debian.org/tracker/CVE-2026-27586

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-2026-27586.json"

Debian:13 / caddy