CVE-2026-75509

Published: Aug 24, 2026Modified: Aug 25, 2026

6.5

Vector

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

Exploitability: 2.2 / Impact: 4.2

Source: security-advisories@github.com (Secondary)

Description

joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption (JOSE) standards. Prior to version 1.7.3, JWTClaimsRegistry applies membership matching to list-valued iss and sub claims, allowing an array-valued iss that contains the expected issuer to pass an intended equality check and enabling issuer-validation bypass. This issue is fixed in version 1.7.3.

Related CWEs

CWE-290

Authentication Bypass by Spoofing

This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks.

CWE-345

Insufficient Verification of Data Authenticity

The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data.

References (3)

https://github.com/authlib/joserfc/commit/76ee6a59bf5773c0af00b99076c5e199031f97f1

Source: security-advisories@github.com

https://github.com/authlib/joserfc/security/advisories/GHSA-r74j-q665-7rpj

Source: security-advisories@github.com

https://github.com/authlib/joserfc/security/advisories/GHSA-r74j-q665-7rpj

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

Timeline

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