PT-2026-52587 · Wolfssl · Wolfssl

Nicholas Carlini · Published 2026-06-25 · Updated 2026-06-25 · CVE-2026-6679

Mitre

CVSS v4.0

8.8

High

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N

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.

Fix

Integer Overflow

Memory Corruption

Weakness Enumeration

CWE-190

CWE-197

CWE-787

Related Identifiers

CVE-2026-6679

Affected Products

Wolfssl

References · 3

• https://github.com/wolfSSL/wolfssl/pull/10116 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-6679 · Security Note
• https://wolfssl.com/docs/security-vulnerabilities · Note