Bug 2523102 (CVE-2026-75509) - CVE-2026-75509 joserfc: joserfc: Issuer-validation bypass via array-valued claims
Summary: CVE-2026-75509 joserfc: joserfc: Issuer-validation bypass via array-valued cl...
Keywords:
Status: NEW
Alias: CVE-2026-75509
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
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Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-24 20:21 UTC by OSIDB Bzimport
Modified: 2026-11-03 08:30 UTC (History)
47 users (show)

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Description OSIDB Bzimport 2026-08-24 20:21:54 UTC 
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.
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