HIGHVulnerability
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Global

NVD HIGH: CVE-2026-6679 — A heap buffer overflow could occur in the DTLS 1.3 ACK serialization path before...

·Source: NIST NVD

Updated:

Executive Summary

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 relea

Analysis

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: 7.5. Published: 2026-06-25T21:16:28.167.

Indicators of Compromise (1)

CVE (1)
CVE-2026-6679
NVDMITRE CVE
Source Attribution

Originally published by NIST NVD on Jun 25, 2026. Verified by: NIST.

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