CVE-2026-102268

Publication date 28 September 2026

Last updated 27 October 2026

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

9.1 · Critical

Score breakdown

Description

PyJWT is a Python implementation of JSON Web Token standards. Prior to 2.14.0, is_pem_format in jwt/utils.py is affected because is_pem_format does not recognize every PEM representation accepted by the cryptography loader. This occurs when an application mixes HMAC and asymmetric algorithms and supplies a mutated public-key PEM as raw key bytes. As a result, HMACAlgorithm.prepare_key treats the unrecognized asymmetric public key as an HMAC secret. Consequently, an attacker who knows the public key can forge authenticated HMAC tokens. This issue is fixed in version 2.14.0.

Status

Package Ubuntu Release Status
pyjwt 26.10 stonking
Fixed in 2.13.0-1ubuntu1
26.04 LTS resolute
Fixed in 2.10.1-4ubuntu1.2
24.04 LTS noble
Fixed in 2.7.0-1ubuntu0.3
22.04 LTS jammy
Fixed in 2.3.0-1ubuntu0.5
20.04 LTS focal
Fixed in 1.7.1-2ubuntu2.1+esm3
18.04 LTS bionic
Fixed in 1.5.3+ds1-1ubuntu0.1+esm3
16.04 LTS xenial
Not affected

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Severity score breakdown

CVSS version: CVSS v3.0

Base score 9.1 · Critical

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

References

Related Ubuntu Security Notices (USN)

Other references

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