SB2026051442 - Remote denial of service in BIG-IP DNS Cache implementation
Published: May 14, 2026
Security Bulletin ID
SB2026051442
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Access of Uninitialized Pointer (CVE-ID: CVE-2026-39458)
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.
Remediation
Install update from vendor's website.