PT-2026-44398 · Jpadilla · Pyjwt

Published 2026-05-28 · Updated 2026-05-28 · CVE-2026-48526

NVD

CVSS v3.1

7.4

High

Base vector

AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

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.

Fix

Improper Authentication

Improper Verification of Cryptographic Signature

Weakness Enumeration

CWE-287

CWE-347

Related Identifiers

CVE-2026-48526

Affected Products

Pyjwt

References · 2

• https://nvd.nist.gov/vuln/detail/CVE-2026-48526 · Security Note
• https://github.com/jpadilla/pyjwt/security/advisories/GHSA-xgmm-8j9v-c9wx · Note