Quick answers
- Is CVE-2026-91843 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-91843 being exploited in the wild.
- How severe is CVE-2026-91843?
- Critical severity, with a CVSS score of 9.8, published 16 September 2026.
- Which products and versions are affected?
- Check Point Security Management Server; Check Point Log Server.
- Is there a fix for CVE-2026-91843?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-91843 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-91843?
- Check whether you run Check Point Log Server or Check Point Security Management Server. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is a stack overflow in the login process of Check Point Security Management and Log Servers that can be triggered during unauthenticated access. The stack overflow occurs before authentication is completed, meaning no valid credentials are required to exploit it. A remote network attacker can exploit this vulnerability to achieve arbitrary code execution with root privileges on the affected servers. The attack vector is network-based and does not require user interaction or prior authentication.
Affected products
- Check Point Security Management Server
- Check Point Log Server
Timeline
- 2026-09-16: disclosed