#VU125561 Always-Incorrect Control Flow Implementation in OpenSSL - CVE-2026-2673
Published: April 9, 2026
Vulnerability identifier: #VU125561
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-2673
CWE-ID: CWE-670
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
OpenSSL
OpenSSL
Software vendor:
OpenSSL Software Foundation
OpenSSL Software Foundation
Description
The vulnerability allows a remote attacker to cause the use of a less preferred key agreement group.
The vulnerability exists due to improper implementation of group tuple handling in TLS 1.3 server key exchange group negotiation when processing a ClientHello with initial predicted keyshares while the server configuration uses the "DEFAULT" keyword. A remote attacker can send a crafted TLS handshake to cause the use of a less preferred key agreement group.
No OpenSSL FIPS modules are affected because the vulnerable code lies outside the FIPS boundary.
Remediation
Install security update from vendor's website.