CVE-2026-27586

Katalog CVE

CVSS 9.1 · Critical EPSS 0,40%

Kerentanan Improper Handling of Exceptional Conditions pada caddyserver caddy. Skor CVSS 3.1 9.1 (Critical) menurut NVD.

Deskripsi (NVD)

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.

Rincian

Terbit di NVD

24 Februari 2026

Terakhir diubah

17 Juni 2026

Status NVD

Analyzed

CVSS 3.1

9.1 (Critical), sumber NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-755: Improper Handling of Exceptional Conditions

EPSS (30 hari)

0,40% peluang dieksploitasi; lebih tinggi dari 32,0% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://github.com/caddyserver/caddy/security/advisories/GHSA-hffm-g8v7-wrv7 exploit · advisory vendor
• https://gist.github.com/moscowchill/9566c79c76c0b64c57f8bd0716f97c48 exploit
• https://github.com/caddyserver/caddy/releases/tag/v2.11.1 release notes