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critical vulnerability

PyJWT: Asymmetric-PEM detection bypass: whitespace/line-ending-mutated public keys skip the HS/asymmetric confusion guard

Fix availableCritical · CVSS 9.1EPSS 0.20%

Published Sep 29, 2026 · updated Sep 29, 2026

What to do

  1. Upgrade to a fixed version: PyJWT 2.14.0.
  2. Redeploy and restart long-running processes so they load the fixed code.

Affected packages

PyPIPyJWT157,042,122 downloads/week

Vulnerable versions
<= 2.13.0
Fixed in
2.14.0

Check your project: pip show PyJWT

Sources

CWE-347 Improper Verification of Cryptographic Signature

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