Go to homepageCyberStrike

Menu

Star on GitHub · 3.4k
Sign inDownload

CVE-2026-102266

7.4 · HIGH

PyJWT is a Python implementation of JSON Web Token standards.

Published Sep 28, 2026pyjwt_projectCWE-347EPSS 0.22%

Overview

CVE-2026-102266 is a high-severity vulnerability affecting pyjwt_project pyjwt. It was published on September 28, 2026 and has a CVSS 3.1 base score of 7.4 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.4, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

PyJWT is a Python implementation of JSON Web Token standards. From 2.13.0 until 2.14.0, HMACAlgorithm.from_jwk is affected because PyJWK verification path used the decoded key without applying prepare_key validation. This occurs when a trusted JWK Set contains an oct entry with an empty k value. As a result, an attacker signs an HMAC token with the same zero-length key accepted by PyJWT. Consequently, forged token can carry arbitrary authenticated claims. This issue is fixed in version 2.14.0.

Remediation

Check the references section for vendor advisories and patches from pyjwt_project. Update pyjwt to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus

References

GitHubgithub.com/jpadilla/pyjwt/commit/f91ed44dd65baaf457f4b3353ed35e98a753934cGitHubgithub.com/jpadilla/pyjwt/releases/tag/2.14.0GitHubgithub.com/jpadilla/pyjwt/security/advisories/GHSA-9j54-fg26-wv3rGitHubgithub.com/jpadilla/pyjwt/security/advisories/GHSA-9j54-fg26-wv3r

How CyberStrike helps

Frequently asked questions

What is CVE-2026-102266?

CVE-2026-102266 is a high-severity vulnerability affecting pyjwt_project pyjwt. It was published on September 28, 2026 and has a CVSS 3.1 base score of 7.4 (HIGH).

How severe is CVE-2026-102266?

This vulnerability has a CVSS 3.1 base score of 7.4, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-102266?

Check the references section for vendor advisories and patches from pyjwt_project. Update pyjwt to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-102266?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-102266 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

Related HIGH CVEs from 2026

View all
Browse by year2026202520242023202220212020201920182017201620152014201320122011201020092008200720062005200420032002200120001999
Watch the demo →