CVE-2026-102270
Medium · 4.4CVSS
4.4
EPSS
0.2%
Published
Sep 28, 2026
CISA due date
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The record
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 packages
| Ecosystem | Package | Introduced | Fixed |
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