CVE-2026-102266

Katalog CVE

CVSS 9.1 · Critical EPSS 0,18%

Kerentanan Improper Verification of Cryptographic Signature pada pyjwt project pyjwt. Skor CVSS 3.1 9.1 (Critical) menurut NVD.

Deskripsi (NVD)

PyJWT is a Python implementation of JSON Web Token standards. From 2.13.0 until 2.14.0, HMACAlgorithm.from_jwk is affected because PyJWK verification path used the decoded key without applying prepare_key validation. This occurs when a trusted JWK Set contains an oct entry with an empty k value. As a result, an attacker signs an HMAC token with the same zero-length key accepted by PyJWT. Consequently, forged token can carry arbitrary authenticated claims. This issue is fixed in version 2.14.0.

Rincian

Terbit di NVD

28 September 2026

Terakhir diubah

7 Oktober 2026

Status NVD

Analyzed

CVSS 3.1

9.1 (Critical), sumber NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-347: Improper Verification of Cryptographic Signature

EPSS (30 hari)

0,18% peluang dieksploitasi; lebih tinggi dari 7,2% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://github.com/jpadilla/pyjwt/security/advisories/GHSA-9j54-fg26-wv3r exploit · advisory vendor
• https://github.com/jpadilla/pyjwt/commit/f91ed44dd65baaf457f4b3353ed35e98a753934c patch
• https://github.com/jpadilla/pyjwt/releases/tag/2.14.0 product · release notes