Heap-based buffer overflow in wolfSSL - CVE-2026-5264
Published: April 14, 2026
Vulnerability identifier: #VU125924
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-5264
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code or cause a denial of service.
The vulnerability exists due to a heap-based buffer overflow in DTLS 1.3 ACK message processing when handling a crafted DTLS 1.3 ACK message. A remote attacker can send a specially crafted DTLS 1.3 ACK message to execute arbitrary code or cause a denial of service.
Affected software
wolfSSL
How to mitigate CVE-2026-5264
Install security update from vendor's website.
wolfSSL - update to 5.9.1