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CVE-2026-27586 Caddy is an extensible server platform that uses TLS by default

Description

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.

Produits et versions touchés

Produit Versions touchées Corrigé en
caddy 2.11 premières → < 2.11.1 2.11.1

Références

Chronologie

  1. Publiée
  2. Dernière modification

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CVE-2026-55458 Caddy: RFC 7230 §6.1 compliance issue / Hop-by-hop headers that leak through 2.9 Faible CVE-2026-92700 Caddy is an extensible server platform that uses TLS by default 6.3 Moyenne CVE-2026-92284 Caddy is an extensible server platform that uses TLS by default 6.9 Moyenne CVE-2026-77281 Caddy is an extensible server platform that uses TLS by default 6.5 Moyenne
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