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CRITICAL severity

CVE-2026-50518

CRITICAL

CVE-2026-50518 is a critical-severity (CVSS 9.8) CWE-122 vulnerability in microsoft windows 10 1607. O3 Security detects and blocks CVE-2026-50518 exploitation at runtime via eBPF exploit-chain detection and L7 egress monitoring, even on unpatched systems.

Heap-based buffer overflow in Windows DHCP Server allows an unauthorized attacker to execute code over a network.

Published
Jul 14, 2026
Updated
Jul 22, 2026
Affected
7 products
Patched
See advisory
Exploits
None indexed
Exploitation data as of Jul 22, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Description

Heap-based buffer overflow in Windows DHCP Server allows an unauthorized attacker to execute code over a network.

Affected Products

7 products · 10 configurations
OS
windows 10 1607microsoft
< 10.0.14393.9339
range
OS
windows 10 1809microsoft
< 10.0.17763.9020
range
OS
windows server 2012microsoft
1 version
r2
OS
windows server 2016microsoft
< 10.0.14393.9339
range
OS
windows server 2019microsoft
< 10.0.17763.9020
range
OS
windows server 2022microsoft
< 10.0.20348.5386
range

Detection & mitigation playbook

Vendor / appliance
  1. Detect

    Inventory every microsoft windows 10 1607 deployment and check each version against the affected-products list above. Because the exploit targets the running system rather than your application code, also watch for remote code execution at the network and runtime layer — O3 flags the exploit behaviour from runtime telemetry and egress traffic even before a vulnerable build is confirmed.

  2. Fix

    Apply the microsoft windows 10 1607 security patch or hotfix for CVE-2026-50518 on the affected version, following the vendor advisory for your exact build.

  3. Workarounds

    Cut exposure now: restrict the management/admin interface to trusted networks, segment the device, and apply the vendor's recommended configuration mitigations and any WAF/IPS signature. O3's runtime protection blocks the exploit chain at execution, holding the line on unpatched or end-of-life systems until you can patch.

  4. How O3 protects you

    O3 detects and blocks CVE-2026-50518 exploitation at runtime: eBPF exploit-chain detection, plus L7 egress monitoring that catches the post-exploitation callback and severs the attacker's outbound channel.

Tailored to CVE-2026-50518. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

Heap-based buffer overflow in Windows DHCP Server allows an unauthorized attacker to execute code over a network.
O3 Security · Runtime Protection

Is CVE-2026-50518 being exploited in your environment?

O3's eBPF runtime sensors and L7 egress monitoring detect and block the CVE-2026-50518 exploit chain at execution — protecting unpatched and end-of-life systems until the vendor patch is applied.

CVE-2026-50518: Windows 10 1607 CWE-122… | O3 Security