CVE-2026-2645
Acceptance of CertificateVerify Message before ClientKeyExchange in TLS 1.2
Summary
Acceptance of CertificateVerify Message before ClientKeyExchange in TLS 1.2
Original description
The description as published by the source.
In wolfSSL 5.8.2 and earlier, a logic flaw existed in the TLS 1.2 server state machine implementation. The server could incorrectly accept the CertificateVerify message before the ClientKeyExchange message had been received. This issue affects wolfSSL before 5.8.4 (wolfSSL 5.8.2 and earlier is vulnerable, 5.8.4 is not vulnerable). In 5.8.4 wolfSSL would detect the issue later in the handshake. 5.9.0 was further hardened to catch the issue earlier in the handshake.
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2026-2645 wolfssl
- Ubuntu UBUNTU-CVE-2026-2645 wolfssl
References
- advisory github.com
- advisory nvd.nist.gov
- patch github.com