fido2-lib is vulnerable to DoS via cbor-extract heap buffer over-read in CBOR attestation parsing
### Summary fido2-lib v3.x depends on cbor-x (~1.6.0), which optionally pulls in cbor-extract (C++ native addon). cbor-extract <= 2.2.0 has a heap buffer over-read in `extractStrings()` — a 5-byte CBOR payload crashes Node.js with SIGSEGV. No JS exception, no try/catch, process dead. The crash triggers during WebAuthn registration when the server decodes the attestation object. An attacker sends a crafted authenticator response to the registration endpoint — single request, unauthenticated, instant kill. Fixed in [email protected] / [email protected] (2026-03-08). [email protected] still pins cbor-x ~1.6.0 which resolves to vulnerable cbor-extrac
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