CVE-2026-102272

Publication date 28 September 2026

Last updated 27 October 2026

Ubuntu priority

Cvss 3 Severity Score

Description

PyJWT is a Python implementation of JSON Web Token standards. From 2.13.0 until 2.14.0, HMACAlgorithm.prepare_key in jwt/algorithms.py is affected because raw-JWK detector does not normalize accepted Unicode byte-order marks before checking for JSON. This occurs when a public JWK is prefixed with a UTF-8 BOM and used in a mixed-algorithm verification path. As a result, public JWK bypasses asymmetric-key detection and becomes the HMAC secret. Consequently, an attacker who knows the public key can forge authenticated tokens. This issue is fixed in version 2.14.0.

Status

Show unmaintained releases

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	Fixed in 1.3.0-1ubuntu0.1+esm3

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Severity score breakdown

CVSS version: CVSS v3.0

Base score 7.4 · High

Base metrics

Parameter	Value
Attack vector	Network
Attack complexity	High
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality impact	High
Integrity impact	High
Availability impact	None

Scores

Parameter	Value
Base score	7.4 · High
Exploitability score	-
Impact score	-

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

References

Related Ubuntu Security Notices (USN)

USN-8916-1
PyJWT vulnerabilities
13 October 2026

USN-8916-2
PyJWT vulnerabilities
15 October 2026