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CVE details

CVE-2026-101918

PyJWT is a Python implementation of JSON Web Token standards. From 2.0.0a1 until 2.15.0, PyJWT PyJWKClient.get_signing_key_from_jwt is affected because payload parser catches ValueError but not RecursionError. This occurs when an attacker-controlled recursively nested payload reaches json.loads. As a result, documented PyJWT exception handling does not contain the failure. Consequently, an unauthenticated request can raise an exception that may produce an HTTP 500 response. The advisory-defined affected implementation also includes jwt/api_jwt.py, verify_signature=False. This issue is fixed in version 2.15.0.

Score
5.3 medium
Published
2026-09-28
Links
NVD · cve.org · Report wrong data

Matched ports (1)

PortPackageVersionStatusMaintainer
www/py-pyjwtpy312-pyjwt2.14.0unaddressedsunpoet@FreeBSD.org

Template for a VuXML entry

Range taken from the CVE record, check it before committing. make newentry in security/vuxml creates the vid.

  <vuln vid="FIXME (make newentry)">
    <topic>FIXME -- FIXME</topic>
    <affects>
      <package>
	<name>py312-pyjwt</name>
	<range><lt>2.15.0</lt></range>
      </package>
    </affects>
    <description>
      <body xmlns="http://www.w3.org/1999/xhtml">
	<p>PyJWT is a Python implementation of JSON Web Token standards. From
	2.0.0a1 until 2.15.0, PyJWT PyJWKClient.get_signing_key_from_jwt is
	affected because payload parser catches ValueError but not
	RecursionError. This occurs when an attacker-controlled recursively
	nested payload reaches json.loads. As a result, documented PyJWT
	exception handling does not contain the failure. Consequently, an
	unauthenticated request can raise an exception that may produce an
	HTTP 500 response. The advisory-defined affected implementation also
	includes jwt/api_jwt.py, verify_signature=False. This issue is fixed
	in version 2.15.0.</p>
      </body>
    </description>
    <references>
      <cvename>CVE-2026-101918</cvename>
      <url>https://nvd.nist.gov/vuln/detail/CVE-2026-101918</url>
    </references>
    <dates>
      <discovery>2026-09-28</discovery>
      <entry>2026-10-26</entry>
    </dates>
  </vuln>