Cloudanix VulnDB

CVE-2026-12340

High · 7.5

CVSS

7.5

EPSS

0.3%

Published

Jun 25, 2026

CISA due date

—

The record

Out-of-bounds heap read during SM2/SM3 certificate signature verification. When parsing a certificate with an SM3wSM2 signature, the Subject Key Identifier computation reads the trailing 65 bytes of the public key without checking that the key is at least that long. A public key shorter than 65 bytes results in an out-of-bounds heap read, leading to a potential crash (denial of service); there is no out-of-bounds write. Note this only affects builds with SM2 support (--enable-sm2 or --enable-all).

Affected packages

Ecosystem Package Introduced Fixed

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