What is CVE-2026-12340?

CVE-2026-12340 is a security advisory published by Microsoft Security Response Center (MSRC) with Medium severity. Out-of-bounds heap read in SM2/SM3 certificate Subject Key Identifier computation

Which CVE IDs does CVE-2026-12340 cover?

CVE-2026-12340 covers the following CVE IDs: CVE-2026-12340. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-12340?

CVE-2026-12340 has a CVSS v3 base score of 7.5, published by Microsoft Security Response Center (MSRC).

CVE-2026-12340MediumCVSS 7.5

Out-of-bounds heap read in SM2/SM3 certificate Subject Key Identifier computation

Vendor

Microsoft Security Response Center (MSRC)

Published

July 1, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-12340 →