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CVE-2026-91843 is a critical stack-based buffer overflow in the unauthenticated login handling of Check Point Security Management Server, Multi-Domain Security Management Server, Log Server, and Multi-Domain Log Server products. An excessively long, attacker-controlled username can trigger the overflow before authentication completes. A remote unauthenticated attacker may thereby execute arbitrary code with root privileges. Affected releases include R82.20; R82.10 with Jumbo Hotfix Take 44 or earlier; R82 with Take 126 or earlier; R81.20 with Take 166 or earlier; and specified end-of-support R81.10, R80-R80.40, and R81 releases. Smart-1 Cloud is not affected.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
20 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical, unauthenticated network-accessible stack-based buffer overflow in Check Point security management and logging systems. A remote attacker can send an oversized username during login to execute arbitrary code with root privileges before authentication.
A critical (CVSS 9.8) pre-authentication, stack-based buffer overflow in Check Point security management and logging systems. An unauthenticated network attacker can submit an overly long username during login to achieve arbitrary code execution with root privileges.
A stack-overflow vulnerability in an unauthenticated login process that may permit remote arbitrary-code execution with root privileges.
A critical (CVSS 9.8) unauthenticated remote stack-overflow vulnerability in the login process of Check Point Security Management and Log Servers that can enable arbitrary code execution with root privileges.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.