CVE-2026-12340 — Out-of-bounds heap read in SM2/SM3 certificate Subject Key Identifier computation
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…
Published: 2026-06-25 · CVSS: 6.3 · CVSS 4.0
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).
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7