This page tracks the Ubuntu fix status. The vulnerability itself is described on the main CVE page. View CVE-2026-75509 →

UBUNTU-CVE-2026-75509

joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption (JOSE) standards. Prior to version 1.7.3, JW...

Original description

The description as published by the source.

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.

Source: OSV.dev (Open Source Vulnerabilities) OSV

Affected packages

Ubuntu:26.04:LTS joserfc

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

References

report ubuntu.com
report cve.org
report github.com