CVE-2026-6679 — DTLS 1.3 ACK serialization heap buffer overflow via integer truncation

CVE-2026-6679

DTLS 1.3 ACK serialization heap buffer overflow via integer truncation PUBLISHED

Description (CNA)

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 (CNA)

Vendor / product	Versions
wolfSSL / wolfSSL	affected 5.4.0 through 5.9.0

CWE

CWE-787, CWE-190, CWE-197

References

https://github.com/wolfSSL/wolfssl/pull/10116
https://www.wolfssl.com/docs/security-vulnerabilities/

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.