joserfc: joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption (JOSE) stan...
CVE-2026-75509 is fixed in joserfc on 1 platform by DEBIAN-CVE-2026-75509 (version 1.7.3-1), released August 26, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| joserfc · Debian 14 | 1.7.3-1 | DEBIAN-CVE-2026-75509 | Aug 26, 2026 |
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