Answer in brief
CVE-2026-12340 records a Medium severity (CVSS 6.3) vulnerability in Out-of-bounds heap read in SM2/SM3 certificate Subject Key Identifier computation. The current sources do not mark it as known exploited. The current feed maps wolfSSL/wolfSSL (generic), wolfSSL/wolfSSL (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 6.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps wolfSSL/wolfSSL (generic), wolfSSL/wolfSSL (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| wolfSSL/wolfSSLgeneric | 5.6.4 | Not reported |
| wolfSSL/wolfSSLgeneric | >=5.6.4 <=5.9.1 | Not reported |
Published upstream
Jun 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jun 26, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 25, 2026
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).
Quoted source text, attributed separately from HOL analysis.