CVE-2026-6679
A heap buffer overflow could occur in the DTLS 1.3 ACK serialization path before the connecting peer is authenticated. The buffer overflow was due to an integer truncation when computing the length of the ACK record-number list, causing an undersized buffer to be allocated and then overrun. This affects builds using DTLS 1.3 and wolfSSL version 5.9.0 and earlier. A fix was added to the 5.9.1 release.
- Affected products
- Wolfssl
- Wolfssl
- < 5.9.1
- Fix
- Available
- CVSS 4.0
- 8.8 HIGH
- CVSS 3.1
- 7.5 HIGH
- EPSS
- 0.5% (41th percentile)
- Weakness
- CWE-787, CWE-197, CWE-190
- NVD status
- Analyzed
- Published
- 2026-06-25
CVE-2026-6679 at NVD
No indexed exploits for CVE-2026-6679 yet
Our index is partial: it proves presence, never absence
No exploit for CVE-2026-6679 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.