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 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...