Description (CNA)
fast-jwt provides fast JSON Web Token (JWT) implementation. In 6.2.4, fast-jwt can classify raw serialized public JWK or JWKS JSON as an HMAC secret because src/crypto.js performDetectPublicKeyAlgorithms treats non-PEM strings as symmetric key material. If HS256 is explicitly allowed or inferred, an attacker who knows the exact serialized public-key bytes can use those bytes as an HMAC key and create a token containing arbitrary claims that createVerifier accepts. Serialization ordering or whitespace differences can prevent exploitation, and applications using supported PEM keys with an asymmetric-only algorithm allowlist are not affected. This issue is fixed in version 6.3.0.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| nearform / fast-jwt | affected >= 6.2.4, < 6.3.0 |
CWE
CWE-347
References
- https://github.com/nearform/fast-jwt/security/advisories/GHSA-g3jj-5cmm-3hxx
- https://github.com/nearform/fast-jwt/pull/636
- https://github.com/nearform/fast-jwt/commit/10f9591349199ed2ab9fa1748ce92cdca697f6cf
- https://github.com/nearform/fast-jwt/releases/tag/v6.3.0
ADP enrichment
No English description supplied.