What is CVE-2026-102274?

CVE-2026-102274 is a medium-severity vulnerability in Jpadilla Pyjwt, classified under Improper Handling of Exceptional Conditions. CVSS score: 5.9/10. Published 2026-09-28.

How severe is CVE-2026-102274?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Vulnerability in Jpadilla Pyjwt

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.

Published 2026-09-28.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Jpadilla Pyjwt — versions >= 2.9.0, < 2.14.0

Weakness classification (CWE)

CWE-755 — Improper Handling of Exceptional Conditions

References

Frequently asked questions

What is CVE-2026-102274?: CVE-2026-102274 is a medium-severity vulnerability in Jpadilla Pyjwt, classified under Improper Handling of Exceptional Conditions. CVSS score: 5.9/10. Published 2026-09-28.
How severe is CVE-2026-102274?: Medium severity. CVSS v3 base score is 5.9 out of 10.