Main Vulnerability Database Vulnerabilities #VU150518

Improper handling of exceptional conditions in pyjwt - CVE-2026-102274

Published: September 17, 2026 / Updated: September 29, 2026

Vulnerability identifier: #VU150518

CSH Severity: Medium

CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-102274

CWE-ID: CWE-755

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper handling of exceptional conditions in PyJWKSet and RSAAlgorithm.from_jwk when parsing a JWK Set containing a malformed RSA private key. A remote attacker can provide a JWK Set containing an RSA key with an invalid private exponent to cause a denial of service.

Affected software

pyjwt
Ubuntu
python3-jwt (Ubuntu package)
python-jwt (Ubuntu package)

How to mitigate CVE-2026-102274

Install security update from vendor's website.

python3-jwt (Ubuntu package) - addressed in versions 1.3.0-1ubuntu0.1+esm4, 1.5.3+ds1-1ubuntu0.1+esm4, 1.7.1-2ubuntu2.1+esm4, 2.3.0-1ubuntu0.6, 2.7.0-1ubuntu0.4, 2.10.1-4ubuntu1.3, 2.13.0-1ubuntu1.1
python-jwt (Ubuntu package) - addressed in versions 1.3.0-1ubuntu0.1+esm4, 1.5.3+ds1-1ubuntu0.1+esm4

External References

Related Security Bulletins