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Advisory record · GHSA-w2cx-738m-mc7w

PyJWT accepts public JWK containers as HMAC secrets

CVSS 7.4 HighEPSS 0.0018 · 6th percentile

Published by the GitHub Advisory Database at 29 Sept 2026, 23:16 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
pyjwtPyPI>=2.13.0, <2.14.02.14.0
Identifiers
GHSA-w2cx-738m-mc7w · CVE-2026-102273 · PYSEC-2026-4151
Weakness (CWE)
CWE-347
Tags
Published
29 Sept 2026
Updated
1 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

PyJWT versions 2.13.0 up to but not including 2.14.0 accept a public RSA, EC, or OKP key wrapped in a JWKS object, array, or similar container as an HMAC secret. An attacker who knows the public key can forge HS256, HS384, or HS512 tokens only if the application allows both HMAC and asymmetric algorithms and passes the same raw public JWK JSON as both the key and the HMAC secret. Upgrade to PyJWT 2.14.0, which contains the fix.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.4 High 3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0018, the 6th percentile, on 7 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:09 UTC First seen by agentprime
  2. 31 Oct 2026, 14:09 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.