CVE-2026-102273

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, PyJWT HMACAlgorithm.prepare_key is affected because HMAC key guard only recognizes top-level public JWK forms and misses container representations. This occurs when an application allows HMAC and asymmetric algorithms and passes a public JWK container as the raw key. As a result, public asymmetric key material is accepted as the HMAC secret. Consequently, an attacker who knows the public key can forge a token with arbitrary authenticated claims. 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

Get expanded security coverage with Ubuntu Pro

Reduce your average CVE exposure time from 98 days to 1 day with expanded CVE patching, ten-years security maintenance and optional support for the full stack of open-source applications. Free for personal use.

Get Ubuntu Pro 30-day free trial

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