Authlib is a Python library which builds OAuth and OpenID Connect servers. From version 1.6.5 to before version 1.6.7, previous tests involving passing a malicious JWT containing alg: none and an empty signature was passing the signature verification step without any changes to the application code when a failure was expected.. This issue has been patched in version 1.6.7.
zetlyn/cve-nvd vulnerability cve CVE-2026-28802 cpe cpe:2.3:a:authlib:authlib:*:*:*:*:*:*:*:* known 2026-03-06
https://nvd.nist.gov/vuln/detail/CVE-2026-28802
Properties
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|---|---|---|---|---|---|
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Text
Authlib is a Python library which builds OAuth and OpenID Connect servers. From version 1.6.5 to before version 1.6.7, previous tests involving passing a malicious JWT containing alg: none and an empty signature was passing the signature verification step without any changes to the application code when a failure was expected.. This issue has been patched in version 1.6.7.
Authlib es una librería de Python que construye servidores OAuth y OpenID Connect. Desde la versión 1.6.5 hasta antes de la versión 1.6.7, pruebas anteriores que implicaban pasar un JWT malicioso que contenía alg: none y una firma vacía estaban pasando el paso de verificación de firma sin ningún cambio en el código de la aplicación cuando se esperaba un fallo. Este problema ha sido parcheado en la versión 1.6.7.