CVE-2026-6679

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 release.

Affected Software

Weaknesses

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

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: partial

References

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

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