Vulnerabilities CVE-2026-48526

CVE-2026-48526

High

Open

TLP:CLEAR

PyJWT: Public-key JWK accepted as HMAC secret enables forged HS256 tokens when mixed families are allowed

NVD CVE.org

Critical Infrastructure

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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.

Details

CVSS Score: 7.4
EPSS Score ⓘ: 0.40%

32.5th percentile
CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Confidence: 90%
Published: May 28, 2026
Last Modified: Aug 12, 2026

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