PT-2026-52564 · Wolfssl · Wolfssl

Published 2026-06-25 · Updated 2026-06-25 · CVE-2026-12340

Mitre

CVSS v4.0

6.3

Medium

Base vector

AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

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).

Fix

Out of bounds Read

Weakness Enumeration

CWE-125

Related Identifiers

CVE-2026-12340

Affected Products

Wolfssl

References · 3

• https://github.com/wolfSSL/wolfssl/pull/10641 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-12340 · Security Note
• https://wolfssl.com/docs/security-vulnerabilities · Note