Server-Side Request Forgery (SSRF) in pyjwt - #VU132101
Published: May 21, 2026
Vulnerability identifier: #VU132101
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: N/A
CWE-ID: CWE-918
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: jpadilla (José Padilla)
Affected software:
pyjwt
pyjwt
Detailed vulnerability description
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to server-side request forgery in PyJWKClient when processing attacker-influenced JKU URLs. A remote attacker can supply a URL using the file://, ftp://, or data: scheme to disclose sensitive information.
User interaction is required, and exploitation depends on an application passing an attacker-influenced jku value to PyJWKClient.
Remediation
Install security update from vendor's website.