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CVE-2026-56159 is a heap-based buffer overflow vulnerability in the Windows DHCP Server service. The flaw is reachable over the network and can be exploited by an unauthorized attacker, indicating that the vulnerable condition exists in processing performed by the DHCP server on attacker-controlled network input. Successful exploitation results in memory corruption in heap memory and can lead to remote code execution on the target DHCP Server system.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
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.
5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability in the DHCP server mentioned as part of the same release; no further technical details are provided in the content.
A critical remote code execution vulnerability affecting the DHCP Server Service.
A critical remote code execution vulnerability in the Windows DHCP Server service.
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.