Access of Uninitialized Pointer in BIG-IP - CVE-2026-39458
Published: May 14, 2026
Vulnerability identifier: #VU131406
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-39458
CWE-ID: CWE-824
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: F5 Networks
Affected software:
BIG-IP
BIG-IP
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to access of uninitialized pointer in the BIG-IP DNS profile with DNS cache enabled when handling undisclosed traffic on a virtual server. A remote attacker can send crafted traffic to cause a denial of service.
There is no control plane exposure; this is a data plane issue only.
How to mitigate CVE-2026-39458
Install security update from vendor's website.