The management server decides how the firewalls behave. The log server holds the evidence used to understand what they saw. A critical Check Point flaw reaches both systems through the login process, before an attacker supplies valid credentials.

CVE-2026-91843 is a stack-based buffer overflow in Check Point Quantum Security Management. Check Point says a remote, unauthenticated attacker can execute arbitrary code as root. The CVSS 3.1 score is 9.8.

The affected roles include Security Management Server, Multi-Domain Security Management Server, Log Server and Multi-Domain Log Server. The Canadian Centre for Cyber Security lists the following supported release thresholds:

End-of-support releases are also affected according to Check Point's CVE record. CERT.LV lists patched target builds of R82.20 Take 29, R82.10 Take 28, R82 Take 28 and R81.20 Take 28. Administrators should reconcile those figures with Check Point's live support article because hotfix guidance can change.

Check Point says customers with automatic LivePatch updates enabled may already be protected. That should be verified rather than assumed. The vendor directs administrators to confirm the patch in the LivePatch inventory. If the fix cannot be applied immediately, restrict the management interface to trusted clients and networks.

No exploitation in the wild was known at the time of the advisory, and no verified public proof of concept was identified in the reviewed sources. Exposure remains consequential because the vulnerable service is the control plane for network policy and audit data.

Fixing CVE-2026-91843 closes the known login overflow. It does not prove that a previously exposed manager was untouched. The…