CVE-2026-41089: exploitation status and patch state

CVE-2026-41089 · CVSS 9.8 CRITICAL · EPSS 80% · patch available

Stack-based buffer overflow in Windows Netlogon allows an unauthorized attacker to execute code over a network.

Is CVE-2026-41089 exploited?

• Not in the CISA KEV catalog.
• EPSS puts exploitation in the next 30 days at 80%.
• Public exploit code: none found in monitored sources.

Which products and versions are affected?

No affected package list recorded here yet.

Is there a patch?

• KB5087538
• KB5087545
• KB5087424
• KB5087539
• KB5087423
• KB5087541
• KB5087537
• KB5087470
• KB5087471

What PlainSec published about CVE-2026-41089

• Netlogon Exploit Puts Active Directory at Risk (2026-06-11)

Primary sources

• NVD record
• Microsoft KB5087538
• Microsoft KB5087545
• Microsoft KB5087424
• Microsoft KB5087539
• Microsoft KB5087423
• Microsoft KB5087541
• Microsoft KB5087537
• Microsoft KB5087470
• Microsoft KB5087471

What this record does not say

• No affected package data.

KEV and EPSS are re-checked daily. Record last updated 2026-08-11.