#VU125941 Out-of-bounds read in wolfSSL - CVE-2026-5772
Published: April 14, 2026
Vulnerability identifier: #VU125941
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-5772
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
wolfSSL
wolfSSL
Software vendor:
wolfSSL
wolfSSL
Description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to an out-of-bounds read in MatchDomainName in src/internal.c when processing wildcard patterns with the LEFT_MOST_WILDCARD_ONLY flag active. A remote attacker can supply a crafted wildcard pattern to cause a denial of service.
The issue is a 1-byte stack buffer over-read that occurs when the wildcard exhausts the entire hostname string.
Remediation
Install security update from vendor's website.