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...

CVE-2026-62995

CVE-2026-62995 affects the Python library joserfc (versions ≤ 1.7.1). The issue: joserfc accepts JWTs with trailing padding (==), which is non-conforming to JOSE specs and enables JWT malleability when parsed by the library. Practical impact varies by deployment and could allow bypass of token re...

PT-2026-65869

Name of the Vulnerable Software and Affected Versions joserfc versions prior to 1.7.2 Description The library accepts JSON Web Tokens JWTs containing trailing padding ==, which does not conform to JSON Object Signing and Encryption JOSE specifications. This results in token malleability, where a...