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 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.

• CWE-248

• https://github.com/jpadilla/pyjwt/commit/5fde08a6cf906aa7698de2d6391d88b73006b17bPatch
• https://github.com/jpadilla/pyjwt/releases/tag/2.15.0Product, Release Notes
• https://github.com/jpadilla/pyjwt/security/advisories/GHSA-42vr-xj54-vc7vExploit, Mitigation, Vendor Advisory

Published

Sep 28, 2026

Last Modified

Oct 7, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-101912ip-address is a library for parsing and manipulating IPv4 an…6.3
• CVE-2026-101913ip-address is a library for parsing and manipulating IPv4 an…6.3
• CVE-2026-101914@grpc/grpc-js implements the core functionality of gRPC pure…6.5
• CVE-2026-101915@grpc/grpc-js implements the core functionality of gRPC pure…3.7
• CVE-2026-101916@grpc/grpc-js implements the core functionality of gRPC pure…7.4
• CVE-2026-101917PyJWT is a Python implementation of JSON Web Token standards…7.5
• CVE-2026-101919A flaw was found in the HyperShift operator. The operator co…8.8
• CVE-2026-10192A vulnerability was identified in Tenda W12 3.0.0.7(4763). T…8.8
• CVE-2026-101920The Molongui Authorship – Author Boxes, Guest Authors & Co-A…7.2
• CVE-2026-101921The WPForms – AI Form Builder for WordPress – Contact Forms,…4.7
• CVE-2026-101923The Photo Reviews for WooCommerce plugin for WordPress is vu…8.1
• CVE-2026-101924The NewStatPress plugin for WordPress is vulnerable to Store…7.2