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VULNERABILITIES

CVE-2026-6679 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://github.com/wolfSSL/wolfssl/pull/10116 [email protected]Issue TrackingPatch
https://www.wolfssl.com/docs/security-vulnerabilities/ [email protected]Vendor Advisory

Weakness Enumeration

CWE-IDCWE NameSource
CWE-787Out-of-bounds Write[email protected]
CWE-190Integer Overflow or Wraparound[email protected]
CWE-197Numeric Truncation Error[email protected]
CWE-787Out-of-bounds Write[email protected]

Affected Products

ProductVersions
wolfssl wolfssl
>= 5.4.0, < 5.9.1

CPE

  • cpe:2.3:a:wolfssl:wolfssl:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

3 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-6679
NVD Published Date:
Jun 25, 2026
NVD Last Modified:
Jun 27, 2026
Source:
[email protected]
CVE-2026-6679 Details - Not Deferred