CVE-2026-102265
Medium
Description
PyJWT is a Python implementation of JSON Web Token standards. From 2.13.0 until 2.14.0, PyJWS._load in jwt/api_jws.py is affected because parser catches ValueError but not RecursionError. This occurs when a deeply nested token header reaches json.loads. As a result, RecursionError escapes the documented PyJWT error hierarchy. Consequently, an unauthenticated malformed token can cause a request-level failure and HTTP 500. This issue is fixed in version 2.14.0.
SeverityMedium
CVSS5.3
Exploit probability—
ProductPyjwt
PublishedSep 28, 2026
First seenSep 28, 2026
Weakness typeCWE-674CWE-674
How to fix
Update
- pyjwt2.14.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| pyjwt_project pyjwt | 2.13.0 | — |
| pyjwtPyPI | 2.13.0 ≤ v < 2.14.0 | 2.14.0 |
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