Affects Windows DHCP Server (widely deployed); RCE in a core network service can disrupt infrastructure and cause broad compromise.
CVE-2026-48564
Heap overflow in Windows DHCP Server allows authenticated remote code execution.
Is CVE-2026-48564 being exploited?
Not confirmed. CVE-2026-48564 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 0.91% probability of exploitation in the next 30 days.
How severe is CVE-2026-48564?
CVE-2026-48564 is rated High with a CVSS score of 8.8. 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-2026-48564?
Yes. A fix has been recorded for CVE-2026-48564. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-48564 affect?
CVE-2026-48564 affects Windows DHCP Server (DHCP role on Windows Server). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-48564?
Apply vendor patch when available; restrict DHCP server network access or disable until patched.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated network attacker can execute arbitrary code as SYSTEM via DHCP server overflow, enabling full server compromise and network disruption.
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 < 6.2.9200.26132
- affected>= 6.3.9600.0 and < 6.3.9600.23228
- affected>= 6.3.9600.0 and < 6.3.9600.23228
- affected>= 6.2.9200.0 and < 6.2.9200.26132
- 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.