CVE-2026-12340: Out-of-bounds heap read in SM2/SM3 certificate Subject Key Identifier computation

Overview

Severity

High (CVSS 7.5)

CVSS Vector

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

Exploit Status

Not Exploited

Patch Tuesday

2026-Jun

Released

2026-07-01

EPSS Score

0.23% (percentile: 13.2%)

Affected Products (1)

Other

• 21516-17084

Revision History

• 2026-07-01: Information published.