Heap-based buffer overflow in wolfSSL - CVE-2026-5447
Published: April 14, 2026
Vulnerability identifier: #VU125929
CSH Severity: High
CVSS v4.0: 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/E:U/U:Amber
CVE-ID: CVE-2026-5447
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: wolfSSL
Affected software:
wolfSSL
wolfSSL
Detailed vulnerability description
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 CertFromX509 when converting an X.509 certificate internally. A remote attacker can supply a crafted X.509 certificate with a malformed AuthorityKeyIdentifier extension to execute arbitrary code or cause a denial of service.
The issue is caused by incorrect size handling of the AuthorityKeyIdentifier extension.
How to mitigate CVE-2026-5447
Install security update from vendor's website.