CVE-2026-65628 Infinite recursion (CPU denial-of-service) in JOSE.JWK.shared_secret/2 on mismatched key types
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-65628?
CVE-2026-65628 is a medium-severity vulnerability in potatosalad jose, published on 26 Oct 2026.
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.
Weakness: CWE-674
Which versions are affected by CVE-2026-65628?
1 open source package ship an affected version, including jose.
| Package | Affected | Fixed in |
|---|---|---|
jose Hex | From 1.5.0 | 1.11.13 |
How do I fix CVE-2026-65628?
Upgrade jose to 1.11.13 or later.
Is CVE-2026-65628 being exploited?
There is no known exploitation of CVE-2026-65628 in the wild and no public exploit code.
Sources
Also known as AZL-111155, DEBIAN-CVE-2026-65628, EEF-CVE-2026-65628, GHSA-fpj2-9h59-32pp, UBUNTU-CVE-2026-65628.