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CVE-2026-102271PyJWT: Public keys in DER form are accepted as HMAC secrets, bypassing the CVE-2022-29217 guard
Descripción
PyJWT is a Python implementation of JSON Web Token standards. From 2.4.0 until 2.14.0, PyJWT HMACAlgorithm.prepare_key is affected because asymmetric-key guard relies on textual markers that are absent from DER encoding. This occurs when an application mixes HMAC and asymmetric algorithms and supplies a DER public key as the shared verification key. As a result, PyJWT uses public DER bytes as an HMAC secret. Consequently, an attacker who knows the public key can forge authenticated HMAC tokens. This issue is fixed in version 2.14.0.
Debilidad (CWE):
CWE-347
Datos: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Se publican tal como los indican las fuentes, en inglés.
Productos y versiones afectados
| Fabricante | Producto | Versiones | |
|---|---|---|---|
| jpadilla | pyjwt | >= 2.4.0, < 2.14.0 | |
| pyjwt project | pyjwt | 2.4.0 – < 2.14.0 |
Referencias y parches
- https://github.com/jpadilla/pyjwt/security/advisories/GHSA-p4g4-x82p-q773 ExploitPatchVendor Advisory
- https://github.com/jpadilla/pyjwt/commit/2798504fa2663364573cf2d1043d8d7fef389499 Patch
- https://github.com/jpadilla/pyjwt/releases/tag/2.14.0 ProductRelease Notes
Coincidencias CPE (NVD) (1)
cpe:2.3:a:pyjwt_project:pyjwt:*:*:*:*:*:*:*:*≥ 2.4.0 < 2.14.0