CVEvulnerability

CVE-2026-102270

4.9 MEDIUM Published 2026-09-28 Modified 2026-10-06 Official page ↗
Status
Analyzed
Published
2026-09-28
Last modified
2026-10-06
Assigner
[email protected]
CVSS 3.1 ([email protected])
4.4 MEDIUM — CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
CVSS 3.1 ([email protected])
4.9 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Weaknesses
CWE-1333

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.

Affected configurations

• pyjwt project pyjwt (< 2.14.0)

Related

Weakness · CWE (1)

  • CWE-1333 Inefficient Regular Expression Complexity weakness

References