VULNERABILITY INTELLIGENCE

CVE-2026-6679

CVSS score8.8 HIGH
EPSS probability0.51%
CISA KEVNot currently listed
Published2026-06-25
Last modified2026-06-27
CVSS vectorCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N

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.

Weakness classification

  • CWE-190: Integer Overflow or Wraparound
  • CWE-197: Numeric Truncation Error
  • CWE-787: Out-of-bounds Write

Primary references