Uncaught Exception Affecting pyjwt package, versions [2.0.0a1,2.15.0)
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.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-PYTHON-PYJWT-20246066
- published29 Sept 2026
- disclosed28 Sept 2026
- creditEkalabya Ghosh
Introduced: 28 Sep 2026
NewCVE-2026-101918 (opens in a new tab)How to fix?
Upgrade PyJWT to version 2.15.0 or higher.
Overview
PyJWT is a Python implementation of RFC 7519.
Affected versions of this package are vulnerable to Uncaught Exception via _decode_payload in jwt/api_jwt.py, where a JWT token containing a deeply nested JSON payload triggers an unhandled RecursionError during json.loads parsing. An attacker can crash the application by submitting a token whose payload is a recursively nested JSON structure, causing an uncaught exception that propagates out of the decode path.