CVE-2026-102274

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

CVE-2026-102274 is fixed in 3 products on 1 platform, first by python3-jwt 2.10.1-4ubuntu1.3, released September 28, 2026. It is not reported as exploited. Patch Radar priority: High.

High

CVSS

7.5

Moderate

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0055

46th percentile

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.

Where it's fixed

Product	Fixed in	Fix	Released
Linux
pyjwt · Debian 14	2.14.0-1	DEBIAN-CVE-2026-102274	Oct 4, 2026
python-PyJWT · opensuse-leap 16.0	2.12.1-160000.3.1	OPENSUSE-SU-2026:22074-1	Nov 7, 2026
python-PyJWT · sles 16.0	2.12.1-160000.3.1	SUSE-SU-2026:24219-1	Nov 7, 2026
python3-jwt · Ubuntu 22.04.1 LTS (jammy)	2.3.0-1ubuntu0.6	python3-jwt 2.3.0-1ubuntu0.6	Oct 27, 2026
python3-jwt · Ubuntu 24.04.5 LTS (noble)	2.7.0-1ubuntu0.4	python3-jwt 2.7.0-1ubuntu0.4	Oct 27, 2026
python3-jwt · Ubuntu 26.04.1 LTS (resolute)	2.10.1-4ubuntu1.3	python3-jwt 2.10.1-4ubuntu1.3	Sep 28, 2026

Details

Published
September 28, 2026
Weakness
Improper Handling of Exceptional Conditions
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-102274

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