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CVE-2026-12340

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

Description (CNA)

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 (CNA)

Vendor / productVersions
wolfSSL / wolfSSLaffected 5.6.4 through 5.9.1

CWE

CWE-125

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.