CVE-2026-85394: PYSEC-2026-4298 - python-jose algorithm confusion guard bypassed by DER-encoded public keys

CVE-2026-85394 · Severity: low · CVSS 3.1 · Published 2026-10-15

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

Technologies: python-jose (PyPI). Vendors: PyPI.

Quick answers

Is CVE-2026-85394 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-85394 being exploited in the wild.
How severe is CVE-2026-85394?
Low severity, with a CVSS score of 3.1, published 15 October 2026.
Which products and versions are affected?
python-jose (PyPI) ECOSYSTEM:introduced=0,fixed=3.4.0, ECOSYSTEM:introduced=0,last_affected=3.5.0.
Is there a fix for CVE-2026-85394?
Yes. python-jose (PyPI): upgrade to 3.4.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2026-85394?
Check whether you run python-jose (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • python-jose (PyPI): upgrade to 3.4.0 or later
    pip install "python-jose>=3.4.0"

Affected products

  • python-jose (PyPI) ECOSYSTEM:introduced=0,fixed=3.4.0, ECOSYSTEM:introduced=0,last_affected=3.5.0

Identifiers

  • CVE-2026-85394
  • CVE-2024-33663
  • GHSA-3qf3-8w2g-rqmx
  • GHSA-6c5p-j8vq-pqhj
  • PYSEC-2024-232
  • PYSEC-2026-4298

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