Out-of-bounds Read in Wolfssl
CVE-2026-12340
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…
Vulnerability class: Buffer Overflow
EPSS: 0.002 (13.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Wolfssl — versions 5.6.4
Weakness classification (CWE)
References
- facts@wolfssl.com (Patch, patch, Issue Tracking)
- facts@wolfssl.com (Vendor Advisory)
Frequently asked questions
- What is CVE-2026-12340?
- CVE-2026-12340 is a high-severity vulnerability in Wolfssl, classified under Out-of-bounds Read. CVSS score: 7.5/10. Published 2026-06-25.
- How severe is CVE-2026-12340?
- High severity. CVSS v3 base score is 7.5 out of 10.