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CVE-2026-85394CVE-2024-33663GHSA-3qf3-8w2g-rqmxGHSA-6c5p-j8vq-pqhjPYSEC-2024-232PYSEC-2026-4298

python-jose algorithm confusion guard bypassed by DER-encoded public keys

mpdavis python-josepipRuntimes & languages
Open in ThreatlineRecord JSON
CVSS
9.3Critical
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.22%Chance of exploitation activity in the next 30 days, higher than 12% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
Published3 Sep 2026Updated 15 Oct 2026CVE List

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

Description

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.

Text from CVE List

Affected versions 42

  • python-jose, pip<= 3.5.0GitHub
  • python-joseaffected: all versions through 3.5.0CVE List
  • python-jose, PyPIfrom first release, through 3.5.0OSV
  • python-jose, PyPI0.1.0OSV
  • python-jose, PyPI0.1.1OSV
  • python-jose, PyPI0.1.2OSV
  • python-jose, PyPI0.1.3OSV
  • python-jose, PyPI0.1.4OSV
  • python-jose, PyPI0.1.5OSV
  • python-jose, PyPI0.1.6OSV
  • python-jose, PyPI0.1.7OSV
  • python-jose, PyPI0.1.8OSV
  • python-jose, PyPI0.2.0OSV
  • python-jose, PyPI0.3.0OSV
  • python-jose, PyPI0.4.0OSV
  • python-jose, PyPI0.5.0OSV
  • python-jose, PyPI0.5.1OSV
  • python-jose, PyPI0.5.2OSV
  • python-jose, PyPI0.5.3OSV
  • python-jose, PyPI0.5.4OSV
  • python-jose, PyPI0.5.5OSV
  • python-jose, PyPI0.5.6OSV
  • python-jose, PyPI0.6.1OSV
  • python-jose, PyPI0.6.2OSV
  • python-jose, PyPI0.7.0OSV
  • python-jose, PyPI1.0.0OSV
  • python-jose, PyPI1.1.0OSV
  • python-jose, PyPI1.2.0OSV
  • python-jose, PyPI1.3.0OSV
  • python-jose, PyPI1.3.1OSV
  • python-jose, PyPI1.3.2OSV
  • python-jose, PyPI1.4.0OSV
  • python-jose, PyPI2.0.0OSV
  • python-jose, PyPI2.0.1OSV
  • python-jose, PyPI2.0.2OSV
  • python-jose, PyPI3.0.0OSV
  • python-jose, PyPI3.0.1OSV
  • python-jose, PyPI3.1.0OSV
  • python-jose, PyPI3.2.0OSV
  • python-jose, PyPI3.3.0OSV
  • python-jose, PyPI3.4.0OSV
  • python-jose, PyPI3.5.0OSV

References 8