Improper Verification of Cryptographic Signature Affecting jws package, versions <3.2.3>=4.0.0 <4.0.1
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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Test your applications- Snyk IDSNYK-JS-JWS-14188253
- published5 Dec 2025
- disclosed4 Dec 2025
- creditFélix Charette
Introduced: 4 Dec 2025
NewCVE-2025-65945 (opens in a new tab)How to fix?
Upgrade jws to version 3.2.3, 4.0.1 or higher.
Overview
jws is an Implementation of JSON Web Signatures
Affected versions of this package are vulnerable to Improper Verification of Cryptographic Signature via the createVerify function when using HS256 HMAC algorithms and incorporating user-provided data from the JSON Web Signature Protected Header or Payload in HMAC secret lookup routines. An attacker can bypass signature verification by manipulating the header or payload to influence the secret lookup process.
Note:
This is only exploitable if the application uses the createVerify function for HMAC algorithms - and not the jws.verify() interface - and relies on user-provided data from the header or payload in secret lookup routines.