CVE-2026-65628Infinite recursion (CPU denial-of-service) in JOSE.JWK.shared_secret/2 on mismatched key types

Official description

jose_jwk:shared_secret/2 (exposed in Elixir as JOSE.JWK.shared_secret/2) derives an ECDH shared secret from two JWKs. Its first function clause only matches when both JWKs carry the same key type (kty) module, and its fallback clause re-invokes itself as shared_secret(from(YourJWK), from(MyJWK)). Because from/1 returns an already-parsed jose_jwk record unchanged, passing two JWKs whose key types differ (for example an EC key and an RSA key) makes the fallback clause re-enter with identical arguments, producing an unbounded tail-recursive loop that never returns and never crashes. An application that derives a shared secret from an externally supplied peer public key without first checking that the peer key's type and curve match its own key can be driven into this loop by an attacker-controlled JWK, pinning an Erlang scheduler at 100% CPU. Repeated requests exhaust the available schedulers, resulting in a denial of service. This issue affects jose: from 1.5.0 before 1.11.13.

Affected packages & fixed versions

Affected products (as reported)

References

• https://github.com/potatosalad/erlang-jose/security/advisories/GHSA-fpj2-9h59-32pp vendor-advisory, related
• EEF CNA record for CVE-2026-65628 related
• OSV record EEF-CVE-2026-65628 related
• Introducing commit 7b80b9f in potatosalad/erlang-jose related
• Fix commit 26182a7 in potatosalad/erlang-jose patch