v2.3.1 — Distrust compromised eMudhra CAs

cloudflare-ddns v2.3.1 — Distrust compromised eMudhra CAs

Security

• Compromised eMudhra CA keys are rejected (CVE-2026-111943, #311). The
  private keys of several emSign (eMudhra) intermediate CAs are compromised.
  On Linux, server certificates are verified by rustls-webpki, which now
  (0.103.16, RUSTSEC-2026-0382) refuses any chain containing one of those
  keys, so they cannot be used to impersonate the Cloudflare API and capture
  the API token, or to spoof IP detection and notification endpoints. macOS
  and Windows builds verify through the OS trust store and are covered by OS
  updates. Thanks to @arminfabritzek for the report.
• The image no longer trusts the affected emSign roots. Its CA bundle
  comes from Alpine ca-certificates 20261020-r0 or newer, which removes
  emSign ECC Root CA - G3, emSign ECC Root CA - C3 and emSign Root CA - C1,
  and the build fails instead of shipping an older bundle. The 2 and 2.3
  images published before this release still trust those roots.

Dependencies

• rustls-webpki 0.103.16, webpki-root-certs 1.0.11 (RUSTSEC-2026-0383),
  h2 0.4.20 (RUSTSEC-2026-0258), anyhow 1.0.104 (RUSTSEC-2026-0190),
  rustls 0.23.46, tokio 1.54.1, serde_json 1.0.154,
  docker/login-action 4.7.0. webpki-root-certs, h2 and anyhow are not in
  the release binary; updating them clears cargo audit.