Windows DHCP Server is a widely deployed Windows Server service; RCE here enables full server/domain compromise and broad infrastructure impact.
CVE-2026-50518
Heap overflow in Windows DHCP Server enabling remote code execution.
Is CVE-2026-50518 being exploited?
Not confirmed. CVE-2026-50518 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.97% probability of exploitation in the next 30 days.
How severe is CVE-2026-50518?
CVE-2026-50518 is rated Critical with a CVSS score of 9.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-50518?
Yes. A fix has been recorded for CVE-2026-50518. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-50518 affect?
CVE-2026-50518 affects Windows DHCP Server (Windows Server DHCP service). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-50518?
Apply vendor patch when available; restrict DHCP to trusted networks, firewall DHCP ports, monitor DHCP logs.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution as SYSTEM over the network against Windows DHCP Server; full server takeover and lateral movement possible.
Immediate action required
- affected>= 10.0.14393.0 and < 10.0.14393.9339
- affected>= 10.0.17763.0 and < 10.0.17763.9020
- affected>= 6.2.9200.0 and < 6.2.9200.26226
- affected>= 6.3.9600.0 and < 6.3.9600.23291
- affected>= 6.3.9600.0 and < 6.3.9600.23291
- affected>= 6.2.9200.0 and < 6.2.9200.26226
- affected>= 10.0.14393.0 and < 10.0.14393.9339
- affected>= 10.0.14393.0 and < 10.0.14393.9339
- affected>= 10.0.17763.0 and < 10.0.17763.9020
- affected>= 10.0.17763.0 and < 10.0.17763.9020
- affected>= 10.0.20348.0 and < 10.0.20348.5386
- affected>= 10.0.26100.0 and < 10.0.26100.33158
- affected>= 10.0.26100.0 and < 10.0.26100.33158
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.