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VULNERABILITIES

CVE-2026-102270 Details

Description

PyJWT is a Python implementation of JSON Web Token standards. Prior to 2.14.0, PyJWT is_pem_format is affected because lazy PEM regular expression backtracks extensively. This occurs when a certificate-like input contains repeated BEGIN markers without a matching END marker. As a result, is_pem_format performs unbounded backtracking while searching for a PEM end marker. Consequently, an attacker can cause intensive CPU consumption. This issue is fixed in version 2.14.0.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:4.4 MEDIUMVector:CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://github.com/jpadilla/pyjwt/security/advisories/GHSA-jwrc-g2q2-pq5p CISA-ADP
https://github.com/jpadilla/pyjwt/commit/8b4e233a22206b34ec1186e912e75c0b2396ac07 [email protected]
https://github.com/jpadilla/pyjwt/releases/tag/2.14.0 [email protected]
https://github.com/jpadilla/pyjwt/security/advisories/GHSA-jwrc-g2q2-pq5p [email protected]

Weakness Enumeration

CWE-IDCWE NameSource
CWE-1333Inefficient Regular Expression Complexity[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

2 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-102270
NVD Published Date:
Sep 28, 2026
NVD Last Modified:
Sep 30, 2026
Source:
[email protected]
CVE-2026-102270 Details - Not Deferred