CVE-2026-12340
- Source
- https://cve.org/CVERecord?id=CVE-2026-12340
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-12340.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-12340
- Downstream
- Published
- 2026-06-25T19:36:21.468Z
- Modified
- 2026-07-16T03:48:15.492485617Z
- Severity
-
- 6.3 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N CVSS Calculator
- Summary
- Out-of-bounds heap read in SM2/SM3 certificate Subject Key Identifier computation
- Details
-
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).
- Database specific
{ "cwe_ids": [ "CWE-125" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/12xxx/CVE-2026-12340.json", "cna_assigner": "wolfSSL" }- References