CVE-2026-42919

Name of the Vulnerable Software and Affected Versions F5 BIG-IP versions prior to 17.1.3.1 F5 BIG-IP versions prior to 17.5.1.4 F5 BIG-IP versions prior to 21.0.0.1

Description A stack-based overflow exists in F5 BIG-IP, which is a condition where a program writes more data to a buffer located on the stack than the buffer is allocated to hold. This issue may allow an authenticated attacker with administrative access to escalate their privileges and cross a security boundary.

Recommendations Update to version 17.1.3.1 or later. Update to version 17.5.1.4 or later. Update to version 21.0.0.1 or later.