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If your Check Point Security Management or Log Server is on an affected release, apply the vendor’s CVE-specific LivePatch and verify it is installed. CVE-2026-91843 is a remotely exploitable, pre-authentication stack overflow that Check Point says could let an attacker execute code with root privileges. If you cannot patch immediately, restrict the web interface to trusted clients as a temporary risk-reduction measure—not as a fix.
What CVE-2026-91843 does
The flaw occurs in the unauthenticated login process for Check Point Security Management and Log Servers. Check Point classifies it as a stack-based buffer overflow (CWE-121); its CVE record says successful exploitation may permit remote code execution with root privileges. The assigned CVSS v3.1 score is 9.8 Critical, with a vector indicating network access, low attack complexity, no required privileges or user interaction, and high confidentiality, integrity, and availability impact. Check Point’s CVE record
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In its September 2026 notification, Check Point stated: “At this time, there is no indication that this vulnerability has been exploited in the wild.” That is the vendor’s assessment at the time of that notification, not a guarantee that exploitation has not occurred since. Check Point’s notification
How to tell whether your server may be affected
Check the product role, software release, and installed Jumbo Hotfix take on each relevant appliance. Government advisories identify these affected configurations:
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| Release | Affected take threshold | Source |
|---|---|---|
| R81.20 | Jumbo Hotfix Take 166 or earlier | Canadian Centre for Cyber Security |
| R82 | Take 126 or earlier | Canadian Centre for Cyber Security |
| R82.10 | Take 44 or earlier | Canadian Centre for Cyber Security |
| R82.20 | Release listed as affected; the advisory does not give a take threshold | Canadian Centre for Cyber Security |
| R81.10 | Take 190 or earlier | CERT.LV |
| R80 through R81 | Older releases are identified as affected; several are marked end of support | CERT.LV and Check Point CVE record |
The affected roles include Security Management Server, Multi-Domain Security Management Server, Log Server, and Multi-Domain Log Server. Canadian Centre for Cyber Security advisory CERT.LV advisory Check Point CVE record
These are exposure thresholds, not proof that a specific server is vulnerable or patched. Confirm the exact installed release and take, then check Check Point’s security knowledge article sk1000155 for current LivePatch instructions and applicability. Older end-of-support releases require particular care: use Check Point Support or your Check Point representative to determine the supported remediation path.
How to patch the vulnerability
- Identify the exact appliance configuration. Record each server’s role, release, and installed Jumbo Hotfix take, including multi-domain management and log servers.
- Consult the vendor’s current instructions. Check the applicable guidance in sk1000155 and Check Point’s official CVE notification. Confirm that the LivePatch applies to your release before making changes.
- Apply the CVE-2026-91843 LivePatch according to Check Point’s instructions. CERT.LV lists fixed takes as R82.20 Take 29, R82.10 Take 28, R82 Take 28, and R81.20 Take 28. Treat these as advisory-specific version thresholds and verify them against the current vendor guidance before relying on them. CERT.LV advisory
- Verify the installed patch. Run
cplp listand confirm that the installed patch comment identifies CVE-2026-91843, as CERT.LV advises. If the output does not clearly identify the CVE-specific patch, do not assume the server is fixed; check the vendor instructions or contact support.
If you cannot patch immediately
Restrict access to the management web interface using Trusted Clients settings. Check Point advises limiting management Trusted Clients to known, specific internal IP addresses; CERT.LV gives the same measure as an interim restriction. Allow only the clients that genuinely need access and follow your organization’s change-control process. Check Point notification CERT.LV advisory
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This setting reduces who can reach the interface; it does not remove the vulnerable code or establish that the LivePatch is installed. Keep the restriction in place until the vendor fix is applied and positively verified. For uncertain applicability or status, Check Point directs customers to Check Point Support or a Check Point representative. Check Point notification
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