AD DS RCE on Domain Controllers; core infrastructure widely used across industries; could disrupt authentication and AD operations.
CVE-2026-45648
RCE via stack-based overflow in Active Directory Domain Services.
Is CVE-2026-45648 being exploited?
Not confirmed. CVE-2026-45648 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 1.1% probability of exploitation in the next 30 days.
How severe is CVE-2026-45648?
CVE-2026-45648 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-2026-45648?
Yes. A fix has been recorded for CVE-2026-45648. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-45648 affect?
CVE-2026-45648 affects Microsoft Active Directory Domain Services (Windows Server). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-45648?
Patch DCs now; restart AD DS; verify AD health.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authorized network attacker can execute arbitrary code on domain controllers via AD DS buffer overflow.
Immediate action required
- affected>= 10.0.20348.0 and < 10.0.20348.5256
- affected>= 10.0.26100.0 and < 10.0.26100.32995
- affected>= 10.0.26100.0 and < 10.0.26100.32995
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.