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CVE-2026-101918

7.5, high

PyJWT is a Python implementation of JSON Web Token standards

NVD (opens in a new tab) CVE.org (opens in a new tab)
CVSS
7.5, high high CVSS v3.1
EPSS, next 30 days
0.4% higher than 27.9% of scored CVEs
Exploitation
Exploit code published
Published
28 Sept 202619 days ago

Description

PyJWT is a Python implementation of JSON Web Token standards. From 2.0.0a1 until 2.15.0, PyJWT PyJWKClient.get_signing_key_from_jwt is affected because payload parser catches ValueError but not RecursionError. This occurs when an attacker-controlled recursively nested payload reaches json.loads. As a result, documented PyJWT exception handling does not contain the failure. Consequently, an unauthenticated request can raise an exception that may produce an HTTP 500 response. The advisory-defined affected implementation also includes jwt/api_jwt.py, verify_signature=False. This issue is fixed in version 2.15.0.

Details

Vendor
Jpadilla
Product
pyjwt
Weakness
CWE-248 (opens in a new tab)
Status
Analyzed
Updated
7 Oct 2026
Assigner
security-advisories@github.com

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References 3

Exploit code 1

Patches and fixes 1

Other references 1

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Jpadilla CVEs

Every Jpadilla CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-102266 PyJWT is a Python implementation of JSON Web Token standards EPSS 0.2% 9.1, critical
  • CVE-2026-102267 Jpadilla pyjwt Exposure of Sensitive Information Vulnerability EPSS 0.2% 9.1, critical
  • CVE-2026-101917 Jpadilla pyjwt Allocation of Resources Without Limits or Throttling Vulnerability EPSS 0.4% 7.5, high
  • CVE-2026-102274 PyJWT is a Python implementation of JSON Web Token standards EPSS 0.4% 7.5, high
  • CVE-2026-102275 PyJWT is a Python implementation of JSON Web Token standards EPSS 0.1% 8.2, high

Beyond this page

Is CVE-2026-101918 in your network?

This page tells you how dangerous CVE-2026-101918 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

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  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

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Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.