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Advisory record · GHSA-gvp8-978c-rx2q

PyJWT.decode() reintroduces options-dict mutation, enabling silent claim-verification bypass on dict reuse

CVSS 6.5 MediumEPSS 0.0026 · 17th percentile

Published by the GitHub Advisory Database at 30 Sept 2026, 23:53 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
pyjwtPyPI>=2.11.0, <=2.13.0No fixed version yet
Identifiers
GHSA-gvp8-978c-rx2q · CVE-2026-103001 · PYSEC-2026-4146
Weakness (CWE)
CWE-471
Tags
Published
30 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 2.11.0 through 2.13.0 modify a caller-supplied options dict when signature verification is disabled. If an application reuses that dict in a later decode call with verification enabled, expired tokens and tokens with mismatched claims can be accepted without error. No fixed version is listed; creating a new options dict for each decode call avoids the problem.

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
6.5 Medium 3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0026, the 17th percentile, on 5 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.