Windows Antivirus | March 2026 | Platform 4.18.26030.3011 | Engine 1.1.26030.3008
Analysis / inference: Microsoft released the March 2026 Windows Antivirus platform update 4.18.26030.3011 and engine 1.1.26030.3008 containing multiple bug fixes and stability improvements.
- Dates
- Source and collection dates not recorded
- Source
- Microsoft Defender for Endpoint releases · Limited verification
- Classification
- Microsoft Security
Section 01 · Summary analysis
Released platform version 4.18.26030.3011, engine version 1.1.26030.3008, and security intelligence 1.449.16.0 with fixes for AMSI exclusions, RPC deadlocks, MPAM package cleanup, and NisSrv stability.
AI summary / analysis; claims are not independently verified. Check the primary source before acting.
Section 02 · Analysis
SecOps Signal analysisThis monthly anti-malware platform and engine update addresses critical reliability bugs, including AMSI exclusion handling flaws, RPC deadlocks, and disk space retention issues affecting endpoint stability.
Reduces disk bloat from failed direct updates, fixes RPC deadlocks, and prevents unwanted AMSI scans on excluded paths.
Section 03 · Recommended actions
- Review endpoint update rings to ensure smooth rollout of platform 4.18.26030.3011 and engine 1.1.26030.3008.
- Verify that registry hive corruption no longer interrupts quick scan tasks.
- Monitor for any residual MPAM package files on systems with failing direct updates.
- Verify deployment status of platform version 4.18.26030.3011 and engine version 1.1.26030.3008 across endpoints.
- Check managed devices for orphaned MPAM packages from failed direct updates that may consume disk space.
- Confirm AMSI configurations correctly honor defined exclusions without triggering redundant scans.