PyJWKClient: missing scheme allowlist enables SSRF + token forgery via file://, ftp://, data: schemes

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SUSE CVE-2026-48522

PyJWT is a JSON Web Token implementation in Python. Prior to 2.13.0, PyJWKClient passes its uri argument directly to urllib.request.urlopen which uses Python stdlib's default OpenerDirector registering HTTPHandler, HTTPSHandler, FTPHandler, FileHandler, and DataHandler. There is currently no...

CVE-2026-48522

PyJWKClient in PyJWT prior to 2.13.0 passes its uri argument directly to urllib.request.urlopen(), allowing attacker-controlled jku URLs to trigger SSRF and related token-forgery scenarios via file://, ftp://, or data: schemes. Affected component: PyJWKClient (Python). Root cause: lack of a schem...

PT-2026-44394

Name of the Vulnerable Software and Affected Versions PyJWT versions prior to 2.13.0 Description PyJWKClient passes the uri argument directly to urllib.request.urlopen, which utilizes the default OpenerDirector of the Python standard library. This allows the registration of HTTPHandler,...

urllib2): Improper management of ftp:// and file:// URL schemes (Issue #11662)

The urllib and urllib2 modules in Python 2.x before 2.7.2 and 3.x before 3.2.1 process Location headers that specify redirection to file: URLs, which makes it easier for remote attackers to obtain sensitive information or cause a denial of service resource consumption via a crafted URL, as...