Vulnerability Description
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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Wolfssl | Wolfssl | >= 5.4.0, < 5.9.1 |
Related Weaknesses (CWE)
References
- https://github.com/wolfSSL/wolfssl/pull/10116Issue TrackingPatch
- https://www.wolfssl.com/docs/security-vulnerabilities/Vendor Advisory
FAQ
What is CVE-2026-6679?
CVE-2026-6679 is a vulnerability with a CVSS score of 7.5 (HIGH). 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...
How severe is CVE-2026-6679?
CVE-2026-6679 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-6679?
Check the references section above for vendor advisories and patch information. Affected products include: Wolfssl Wolfssl.