Improper Cleanup on Thrown Exception Affecting pyjwt package, versions [,2.13.0)
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-PYTHON-PYJWT-17054465
- published29 May 2026
- disclosed28 May 2026
- creditUnknown
Introduced: 28 May 2026
CVE-2026-48524 (opens in a new tab)How to fix?
Upgrade pyjwt to version 2.13.0 or higher.
Overview
Affected versions of this package are vulnerable to Improper Cleanup on Thrown Exception via the get_signing_key function. An attacker can exhaust system resources by sending numerous JWTs with attacker-controlled kid values, causing repeated outbound requests to the JWKS endpoint.
Note:
This is only exploitable if the JWKS fetch fails and the upstream endpoint does not implement effective rate limiting or error handling.