Use of a Broken or Risky Cryptographic Algorithm Affecting benmcollins/libjwt package, versions [3.0.0,3.3.3)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published15 May 2026
- disclosed15 May 2026
- creditNadav0077
Introduced: 15 May 2026
NewCVE-2026-44699 (opens in a new tab)How to fix?
Upgrade benmcollins/libjwt to version 3.3.3 or higher.
Overview
Affected versions of this package are vulnerable to Use of a Broken or Risky Cryptographic Algorithm in the verification process. An attacker can bypass authentication by submitting a JWT signed with an HMAC algorithm and an RSA JWK lacking the alg parameter, resulting in verification with a zero-length key. This is only exploitable if applications load RSA keys from JWKS where alg is omitted and select the verification algorithm from the JWT header, such as in a kid lookup callback.