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High severity7.5NVD Advisory· Published Jun 25, 2026· Updated Jun 27, 2026

CVE-2026-6679

CVE-2026-6679

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.

Affected products

2
  • WolfSSL/Wolfssl2 versions
    cpe:2.3:a:wolfssl:wolfssl:*:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:a:wolfssl:wolfssl:*:*:*:*:*:*:*:*range: >=5.4.0,<5.9.1
    • (no CPE)range: <=5.9.0

Patches

Vulnerability mechanics

References

2

News mentions

2