Improper Authentication in wolfSSL - CVE-2026-93304
Published: October 5, 2026
Vulnerability identifier: #VU153284
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-93304
CWE-ID: CWE-287
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to impersonate a server.
The vulnerability exists due to improper state management in the TLS 1.2 and DTLS 1.2 handshake when receiving an out-of-order ChangeCipherSpec message before ClientKeyExchange. A remote attacker can send an out-of-order ChangeCipherSpec message to impersonate a server.
Certificate-suite exploitation requires a man-in-the-middle position, while PSK connections can be attacked by a fake server without knowledge of the PSK.
Affected software
wolfSSL
How to mitigate CVE-2026-93304
Install security update from vendor's website.
wolfSSL - update to 5.9.4