Improper Encoding or Escaping of Output Affecting get-jwks package, versions <11.0.2
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
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-GETJWKS-13110083
- published29 Sept 2025
- disclosed27 Sept 2025
- creditSagi epureionut99
Introduced: 27 Sep 2025
CVE-2025-59936 (opens in a new tab)How to fix?
Upgrade get-jwks to version 11.0.2 or higher.
Overview
get-jwks is a Fetch utils for JWKS keys
Affected versions of this package are vulnerable to Improper Encoding or Escaping of Output via the JWKS cache process. An attacker can bypass issuer validation by poisoning the cache with keys from an unexpected issuer and subsequently leveraging the cached key to pass signature validation for a targeted issuer value. This is only exploitable if issuer validation is performed after retrieving keys using the affected process.