SB2026051433 - Remote denial of service in BIG-IP PEM iRules
Published: May 14, 2026
Security Bulletin ID
SB2026051433
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) Use-after-free (CVE-ID: CVE-2026-41218)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 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
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to use-after-free in BIG-IP PEM data plane when processing undisclosed traffic on a virtual server with PEM iRules configured. A remote attacker can send traffic to cause a denial of service.
This issue affects the data plane only and has no control plane exposure.
Remediation
Install update from vendor's website.