CVE-2026-102274 (CVSS 5.9)

Description

PyJWT is a Python implementation of JSON Web Token standards. From 2.9.0 until 2.14.0, PyJWKSet does not catch the plain ValueError raised for malformed RSA JWK components by RSAAlgorithm.from_jwk in jwt/api_jwk.py. This occurs when a JWK Set contains a malformed RSA key alongside otherwise usable keys. As a result, one malformed member aborts construction of the entire PyJWKSet. Consequently, applications can experience authentication failures or request-level denial of service. This issue is fixed in version 2.14.0.

Is your site exposed to CVE-2026-102274?

Run a free security scan — no signup, results in seconds.

CVSS v3.1 Score

5.9

MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS — Exploit Prediction

0.0055

Probability of exploitation

0.46%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-755 CWE-755

References

Other References

https://github.com/jpadilla/pyjwt/commit/8915570a0bfda9f0ff0e34e7fb09bdb9d71580cf https://github.com/jpadilla/pyjwt/releases/tag/2.14.0 https://github.com/jpadilla/pyjwt/security/advisories/GHSA-w6j9-cwv2-h6wq https://github.com/jpadilla/pyjwt/security/advisories/GHSA-w6j9-cwv2-h6wq

Frequently Asked Questions

What is CVE-2026-102274? +

PyJWT is a Python implementation of JSON Web Token standards. From 2.9.0 until 2.14.0, PyJWKSet does not catch the plain ValueError raised for malformed RSA JWK components by RSAAlgorithm.from_jwk in jwt/api_jwk.py. This occurs when a JWK Set contains a malformed RSA key alongside otherwise usable keys. As a result, one malformed member aborts construction of the entire PyJWKSet. Consequently, applications can experience authentication failures or request-level denial of service. This issue is fixed in version 2.14.0. It has a CVSS v3.1 base score of 5.9 (MEDIUM).

How severe is CVE-2026-102274? +

CVE-2026-102274 has a CVSS v3.1 score of 5.9 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0055, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-102274? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2026-96294

Uncaught exception, Improper Handling of Exceptional Conditions vulnerability in Apache Thrift NodeJS bindings. This issue affects Apache Thrift: before 0.25.0. …

CVE-2026-54578

mport is the MidnightBSD Package Manager. Prior to 2.7.8, mport_verify_package() in libmport/verify.c could continue after MD5File() or SHA256_File() failed and …

CVE-2026-48036

Hulumi is an open-source toolkit that ships secure-by-default cloud and platform infrastructure components for Pulumi. Prior to version 1.4.0, consumers …

CVE-2026-53459

Bambuddy is a self-hosted print archive and management system for Bambu Lab 3D printers. Starting in version 0.1.6 and prior …

CVE-2026-100300

Improper handling of exceptional conditions in the quota subsystem of Apache ZooKeeper allows an attacker able to write under the …

CVE-2026-42792

Improper Handling of Exceptional Conditions vulnerability in Erlang OTP erts (epmd) allows an unauthenticated remote attacker to permanently terminate the …