CVE WatchOct 7, 2026

CVE-2026-101918

PyJWT is a Python implementation of JSON Web Token standards. From 2.0.0a1 until 2.15.0, PyJWT PyJWKClient.get_signing_key_from_jwt is affec

CVSS

5.3

Medium

EPSS

0.4%

p35

KEV

—

Exploit Today

0-100

Published: Sep 28, 2026 · Last modified: Oct 7, 2026 · CWE-248

EPSS · 30d

0.3%EPSS · 30 days0.4%

2026-09-292026-10-25

Technical description

PyJWT is a Python implementation of JSON Web Token standards. From 2.0.0a1 until 2.15.0, PyJWT PyJWKClient.get_signing_key_from_jwt is affected because payload parser catches ValueError but not RecursionError. This occurs when an attacker-controlled recursively nested payload reaches json.loads. As a result, documented PyJWT exception handling does not contain the failure. Consequently, an unauthenticated request can raise an exception that may produce an HTTP 500 response. The advisory-defined affected implementation also includes jwt/api_jwt.py, verify_signature=False. This issue is fixed in version 2.15.0.

Official references

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