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Advisory record · GHSA-jwrc-g2q2-pq5p

PyJWT: ReDoS vulnerability when calling the `is_pem_format` function.

CVSS 4.4 MediumEPSS 0.0025 · 15th percentile

Published by the GitHub Advisory Database at 30 Sept 2026, 14:40 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-jwrc-g2q2-pq5p · CVE-2026-102270 · PYSEC-2026-4148
Weakness (CWE)
CWE-1333
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 before 2.14.0 has a ReDoS flaw in is_pem_format: malformed PEM-like input makes CPU use grow quadratically. An attacker who can supply key or certificate data to an application using PyJWT can exhaust resources and make it unavailable. Upgrade to PyJWT 2.14.0.

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
4.4 Medium 3.1 CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0025, the 15th percentile, on 8 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.