CVE-2026-102270
4.4
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
Summary
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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| jpadilla | pyjwt | < 2.14.0 | affected |
Weaknesses
- CWE-1333: CWE-1333: Inefficient Regular Expression Complexity
References
- https://github.com/jpadilla/pyjwt/security/advisories/GHSA-jwrc-g2q2-pq5p
- https://github.com/jpadilla/pyjwt/commit/8b4e233a22206b34ec1186e912e75c0b2396ac07
- https://github.com/jpadilla/pyjwt/releases/tag/2.14.0
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