๐Ÿ›ก๏ธ CVE-2026-44699
โšช Unknown โœ… No Known Exploit CWE-327 NVD
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

LibJWT is a C JSON Web Token Library. From 3.0.0 to 3.3.2, libjwt accepts an RSA JWK that does not contain an alg parameter as the verification key for an HS256/HS384/HS512 token. In the OpenSSL backend, this causes HMAC verification to run with a zero-length key, so an attacker can forge a valid JWT without knowing any secret or RSA private key. This is an algorithm-confusion authentication bypass. It affects applications that load RSA keys from JWKS where alg is omitted, which is valid JWK syntax and common in real deployments, and then choose the verification algorithm from the JWT header, for example in a kid lookup callback. This vulnerability is fixed in 3.3.3.

Details

Severity Unknown
CVSS Score N/A
CVSS Vector N/A
CWE CWE-327
Public Exploit โœ… No
Source NVD
Published 2026-05-15
Updated 2026-06-02
Modified 2026-05-18
Fix URL N/A

Affected Packages

Software From version Fixed in
unknown โ€” โ€”

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