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Advisory record · GHSA-9v7f-9g4p-ffgj

PyJWT: PyJWKClient follows redirects when fetching JWKS

CVSS 7.4 HighEPSS 0.0016 · 5th percentile

Published by the GitHub Advisory Database at 29 Sept 2026, 23:15 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
pyjwtPyPI<2.14.02.14.0
Identifiers
GHSA-9v7f-9g4p-ffgj · CVE-2026-102267 · PYSEC-2026-4144
Weakness (CWE)
CWE-200 · CWE-345 · CWE-918
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 before 2.14.0, including 2.13.0, have a flaw in PyJWKClient, which followed HTTP redirects when fetching a JWKS without validating the destination. An attacker who can influence the response from the configured JWKS endpoint could redirect the client to another host, potentially exposing caller-supplied request headers and poisoning the key material used to accept JWTs. Upgrade to PyJWT 2.14.0, which fixes the issue.

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 0.0016, the 5th 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.