CVE-2026-48526: PyJWT: Public-key JWK accepted as HMAC secret enables forged HS256 tokens when mixed families are allowed

Overview

Severity

High (CVSS 7.4)

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Exploit Status

Not Exploited

Patch Tuesday

2026-May

Released

2026-07-24

EPSS Score

0.40% (percentile: 32.1%)

Affected Products (1)

Other

• 20159-17084

Revision History

• 2026-07-24: Information published.