CVE-2026-75509

A flaw was found in joserfc, a Python library for JSON Object Signing and Encryption JOSE standards. A remote attacker could exploit a vulnerability in the JWTClaimsRegistry by crafting a JSON Web Token JWT with an array-valued issuer iss claim. This flaw allows the attacker to bypass the intende...

Linux Distros Unpatched Vulnerability : CVE-2026-75509

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption JOSE standards. Prior to version 1.7.3,...

User Impersonation

Overview Affected versions of this package are vulnerable to User Impersonation through the JWTClaimsRegistry in src/joserfc/rfc7519/claims.py. An attacker can make a JWT with an array-typed iss claim pass an exact-issuer check by supplying a list that contains the expected issuer string...

DEBIAN-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, JWTClaimsRegistry applies membership matching to list-valued iss and sub claims, allowing an array-valued iss that contains the expected issuer to pass...

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, JWTClaimsRegistry applies membership matching to list-valued iss and sub claims, allowing an array-valued iss that contains the expected issuer to pass...

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, JWTClaimsRegistry applies membership matching to list-valued iss and sub claims, allowing an array-valued iss that contains the expected issuer to pass...

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, JWTClaimsRegistry applies membership matching to list-valued iss and sub claims, allowing an array-valued iss that contains the expected issuer to pass...

CVE-2026-75509 joserfc claim-validation bypass via array-typed single-string claims (iss/sub/jti)

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...

CVE-2026-75509 joserfc claim-validation bypass via array-typed single-string claims (iss/sub/jti)

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...

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, JWTClaimsRegistry applies membership matching to list-valued iss and sub claims, allowing an array-valued iss that contains the expected issuer to pass...

CVE-2026-75509

joserfc is a Python library implementing JOSE standards. Prior to version 1.7.3 , the JWTClaimsRegistry applies membership matching to list-valued iss and sub claims, meaning an array-valued iss claim that merely contains the expected issuer will pass an intended equality check. This enables issu...

CVE-2026-49852

A flaw was found in the joserfc Python library. A remote attacker can exploit a vulnerability in the joserfc.jwt.decode function to forge HMAC-signed tokens. This occurs because the library accepts tokens signed with an empty or null verification key, allowing an attacker to bypass integrity...

SUSE CVE-2026-62995

joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption JOSE standards. in versions 1.7.1 and prior, joserfc accepts JWTs with trailing padding == which are not conforming to the JOSE specifications. This leads to malleability of the JWTs when...

CVE-2026-62995

A flaw was found in joserfc, a Python library for JSON Object Signing and Encryption JOSE standards. This vulnerability allows the library to accept JSON Web Tokens JWTs that include non-standard trailing padding. An attacker could exploit this to create malleable JWTs, potentially bypassing...

CVE-2026-62995

joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption JOSE standards. in versions 1.7.1 and prior, joserfc accepts JWTs with trailing padding == which are not conforming to the JOSE specifications. This leads to malleability of the JWTs when...

UBUNTU-CVE-2026-62995

joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption JOSE standards. in versions 1.7.1 and prior, joserfc accepts JWTs with trailing padding == which are not conforming to the JOSE specifications. This leads to malleability of the JWTs when...

CVE-2026-62995 joserfc accepts JWT with padding, leading to JWT malleability

joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption JOSE standards. in versions 1.7.1 and prior, joserfc accepts JWTs with trailing padding == which are not conforming to the JOSE specifications. This leads to malleability of the JWTs when...

CVE-2026-62995 joserfc accepts JWT with padding, leading to JWT malleability

joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption JOSE standards. in versions 1.7.1 and prior, joserfc accepts JWTs with trailing padding == which are not conforming to the JOSE specifications. This leads to malleability of the JWTs when...

CVE-2026-62995 joserfc accepts JWT with padding, leading to JWT malleability

joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption JOSE standards. in versions 1.7.1 and prior, joserfc accepts JWTs with trailing padding == which are not conforming to the JOSE specifications. This leads to malleability of the JWTs when...

CVE-2026-62995

joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption JOSE standards. in versions 1.7.1 and prior, joserfc accepts JWTs with trailing padding == which are not conforming to the JOSE specifications. This leads to malleability of the JWTs when...