CVE-2026-48526

PoC —

CVSS 3.1

7.4 high

EPSS

<1%p33

Published

May 28, 2026 (May 28, 2026)

Modified

Sep 10, 2026

Description

PyJWT is a JSON Web Token implementation in Python. Prior to 2.13.0, when the verifier is decoding JSON Web Tokens, while supporting both asymmetric and HMAC algorithms, the library does not validate use of JSON Web Keys in HMAC algorithm, allowing attacker to use the issuer public key as the secret key for HMAC algorithm. This vulnerability is fixed in 2.13.0.

Vendors: pyjwt project
Products: pyjwt
Weakness: CWE-287, CWE-347
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

NVD CVE.org GitHub PoCs EPSS (0.4%)

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