DISMHost.exe
Also called dismhost, dism host, dism helper
DISM helper host. DISM or TrustedInstaller servicing can spawn it for an image operation. It is not TiWorker applying CBS packages as the main Trusted Installer worker.
What you need to know
DISMHost is a DISM worker, not TiWorker applying CBS packages as the main trusted installer.
DISMHost.exe is a helper the DISM engine starts so an image or package operation can run out of process. TiWorker.exe is Windows Modules Installer Worker for CBS. TrustedInstaller.exe owns the servicing contract. Ending DISMHost does not finish a cumulative update the way TiWorker does.
- Safe?
- Yes, during DISM or servicing
- Same as TiWorker?
- No. This is a DISM worker
- Should I end it?
- Not mid-DISM
What is DISMHost.exe?
DISMHost is a DISM worker, not TiWorker applying CBS packages as the main trusted installer. TiWorker.exe does CBS apply. TrustedInstaller.exe is the Modules Installer. This host is DISM's helper.
What does it do?
It performs DISM work (image mount, package add, cleanup requested through DISM). It does not replace the WinSxS CBS worker and it does not draw Windows Update UI.
Why is it running?
Someone ran DISM, an installer called DISM, or servicing used the DISM stack. Idle DISMHost should exit when that operation ends.
Is it safe?
Usually safe
System32\Dism\DISMHost.exe is Microsoft. A DISMHost.exe in Downloads is not. This is still not TiWorker.exe.
A legitimate copy normally runs from:
C:\Windows\System32\Dism\DISMHost.exe
- DISM helper host
- CBS worker sibling: TiWorker.exe under WinSxS
- Contract sibling: TrustedInstaller.exe
Can I end it?
Not mid-DISM
Ending DISMHost.exe can fail an in-flight DISM operation. Ending TiWorker mid-CBS is a different, update-apply risk. Let DISM finish or reboot if Setup asks.
Can I remove it?
No
Do not delete DISMHost.exe. Component cleanup is a DISM command, not Explorer. Do not delete TiWorker or TrustedInstaller, and do not delete System32.
Should it start with Windows?
A DISM operation starts it. It is not Startup Apps. TiWorker starts from Modules Installer, not from this helper.
Normal resource behavior
These are contextual labels, not universal averages.
- CPU
- Can rise during an image or package op
- Memory
- Moderate on a large WIM or cleanup
- Disk
- High while an image is mounted or WinSxS is scanned via DISM
- Network
- Usually none unless DISM pulls a source
File information
| Executable name | DISMHost.exe |
|---|---|
| Common legitimate path | C:\Windows\System32\Dism\DISMHost.exe |
| Publisher | Microsoft Corporation |
| Signature expectation | Signed by Microsoft Windows |
Common problems
People end TiWorker because they saw DISM in a log
CBS apply is TiWorker. A DISM /RestoreHealth helper is this host. End the wrong one and you interrupt the wrong stack.
Stuck DISM mount after an optimizer killed DISMHost
dism /cleanup-wim or a reboot. Replacing TrustedInstaller.exe will not unmount that image.
Troubleshooting
Diagnose before you change anything destructive.
Check the parent: Dism.exe versus TrustedInstaller
A Command Prompt DISM is this article's usual parent. A Windows Update CBS spike without DISM is TiWorker.
Let the DISM command finish, then review CBS.log only if it failed
Do not run random TrustedInstaller ACL scripts. Do not delete files from System32\Dism.
Technical details
Technical details
| Image name | DISMHost.exe |
|---|---|
| Role | DISM out-of-process helper host |
Sources and verification
Reviewed by Feex editorial. Last verified August 2026 Status: Feex Reviewed. How we research.
- Microsoft Learn: What is DISM · Deployment Image Servicing and Management
- Microsoft Learn: DISM package servicing · DISM operations can run in a helper host
- Foxhole process map · First-party samples on Windows PCs. Not a lab benchmark.
Was this article useful?
A yes or no is enough. Pick a reason if you want, or add a short note.
Thanks. That helps us improve this page.