Improper Authentication in wolfSSL - CVE-2026-55962
Published: July 1, 2026
Vulnerability identifier: #VU136646
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-55962
CWE-ID: CWE-287
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 bypass client certificate authentication.
The vulnerability exists due to improper authentication in TLS 1.3 post-handshake authentication processing when accepting a client's Finished message while a post-handshake CertificateRequest is still outstanding. A remote attacker can send a Finished message without a Certificate and CertificateVerify to bypass client certificate authentication.
Only TLS 1.3 servers built with post-handshake authentication support and configured to request a client certificate after the handshake are affected.
How to mitigate CVE-2026-55962
Install security update from vendor's website.