CVE-2026-102274

MEDIUM 5.9

PyJWT: Malformed RSA JWK aborts parsing of an entire JWK Set

CVSS Score

5.9

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-755
Vendor	jpadilla
Product	pyjwt
Published	Sep 28, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

jpadilla / pyjwt

>= 2.9.0, < 2.14.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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