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CVE details

CVE-2026-85394

python-jose through 3.5.0 fails to properly validate asymmetric keys in HMAC initialization, accepting DER-encoded public keys that lack PEM armor or SSH prefixes. Attackers holding the service's public key can forge HS256 tokens that pass verification when algorithms are not explicitly restricted. This is an incomplete fix for CVE-2024-33663.

Score
9.3 critical
Published
2026-09-03
Links
NVD · cve.org

Matched ports (1)

PortPackageVersionStatusMaintainer
security/py-python-josepy312-python-jose3.5.0unaddressedsunpoet@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-python-jose</name>
	<range><lt>FIXME</lt></range>
      </package>
    </affects>
    <description>
      <body xmlns="http://www.w3.org/1999/xhtml">
	<p>python-jose through 3.5.0 fails to properly validate asymmetric keys
	in HMAC initialization, accepting DER-encoded public keys that lack
	PEM armor or SSH prefixes. Attackers holding the service's public key
	can forge HS256 tokens that pass verification when algorithms are not
	explicitly restricted. This is an incomplete fix for CVE-2024-33663.</p>
      </body>
    </description>
    <references>
      <cvename>CVE-2026-85394</cvename>
      <url>https://nvd.nist.gov/vuln/detail/CVE-2026-85394</url>
    </references>
    <dates>
      <discovery>2026-09-03</discovery>
      <entry>2026-10-26</entry>
    </dates>
  </vuln>