high7.5
CVE-2026-12340
Out-of-bounds heap read during SM2/SM3 certificate signature verification.
Impact
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 products
| Vendor | Product | Affected versions |
|---|---|---|
| Wolfssl | Wolfssl | from 5.6.4 before 5.9.2 |