Extension host terminated unexpectedly no matter what i try

Brian_Walch · March 11, 2026, 2:28pm

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

I start cursor, and receive this error

Steps to Reproduce

Open cursor, wait a minute, and the error appears

Expected Behavior

I want to be able to open a folder, install claude extension, and work in that folder

Operating System

Windows 10/11

Version Information

IDE 2.6.18

Additional Information

I’ve installed clean versions at the system level, including deleting all folders after uninstall. I’ve disabled folder indexing. I have no extensions installed. I’ve added exceptions to MS Defender. I don’t even open a folder. I am not using Cursor against a code base, simply against a folder structure with a writing project. Here is the output from developer tools.

anysphere/context unavailable — tracing will be disabled: TypeError: Failed to resolve module specifier ‘@anysphere/context’
at extensionHostWorkerMain.js:155:144140
(anonymous) @ extensionHostWorkerMain.js:155
workbench.desktop.main.js:46676 [agent_exec] Failed to sync managed skills from dashboard {arch: ‘x64’, platform: ‘win32’, channel: ‘stable’, client_version: ‘2.6.18’, error: ‘Canceled: Canceled’}
_log @ workbench.desktop.main.js:46676
warn @ workbench.desktop.main.js:46676
$logStructuredWarn @ workbench.desktop.main.js:43779
_doInvokeHandler @ workbench.desktop.main.js:46616
_invokeHandler @ workbench.desktop.main.js:46616
_receiveRequest @ workbench.desktop.main.js:46616
_receiveOneMessage @ workbench.desktop.main.js:46616
(anonymous) @ workbench.desktop.main.js:46616
_deliver @ workbench.desktop.main.js:55
fire @ workbench.desktop.main.js:55
fire @ workbench.desktop.main.js:43761
(anonymous) @ workbench.desktop.main.js:49752
workbench.desktop.main.js:64 ERR [Extension Host] (node:23060) [DEP0040] DeprecationWarning: The punycode module is deprecated. Please use a userland alternative instead.
(Use Cursor --trace-deprecation ... to show where the warning was created)
error @ workbench.desktop.main.js:64
error @ workbench.desktop.main.js:64
error @ workbench.desktop.main.js:48653
UMy @ workbench.desktop.main.js:43744
$logExtensionHostMessage @ workbench.desktop.main.js:43744
_doInvokeHandler @ workbench.desktop.main.js:46616
_invokeHandler @ workbench.desktop.main.js:46616
_receiveRequest @ workbench.desktop.main.js:46616
_receiveOneMessage @ workbench.desktop.main.js:46616
(anonymous) @ workbench.desktop.main.js:46616
_deliver @ workbench.desktop.main.js:55
fire @ workbench.desktop.main.js:55
fire @ workbench.desktop.main.js:43761
(anonymous) @ workbench.desktop.main.js:49752
workbench.desktop.main.js:43744 [Extension Host] (node:23060) [DEP0040] DeprecationWarning: The punycode module is deprecated. Please use a userland alternative instead.
(Use Cursor --trace-deprecation ... to show where the warning was created)
FMy @ workbench.desktop.main.js:43744
$logExtensionHostMessage @ workbench.desktop.main.js:43744
_doInvokeHandler @ workbench.desktop.main.js:46616
_invokeHandler @ workbench.desktop.main.js:46616
_receiveRequest @ workbench.desktop.main.js:46616
_receiveOneMessage @ workbench.desktop.main.js:46616
(anonymous) @ workbench.desktop.main.js:46616
_deliver @ workbench.desktop.main.js:55
fire @ workbench.desktop.main.js:55
fire @ workbench.desktop.main.js:43761
(anonymous) @ workbench.desktop.main.js:49752
workbench.desktop.main.js:49748 Extension host (LocalProcess [role: retrieval-always-local] pid: 23060) terminated unexpectedly. Code: 18446744072635810000, Signal: unknown
_onExtensionHostCrashed @ workbench.desktop.main.js:49748
_onExtensionHostCrashed @ workbench.desktop.main.js:49753
_onExtensionHostCrashOrExit @ workbench.desktop.main.js:49748
(anonymous) @ workbench.desktop.main.js:49748
_deliver @ workbench.desktop.main.js:55
fire @ workbench.desktop.main.js:55
_onExtHostProcessExit @ workbench.desktop.main.js:49752
(anonymous) @ workbench.desktop.main.js:49752
_deliver @ workbench.desktop.main.js:55
fire @ workbench.desktop.main.js:55
l @ workbench.desktop.main.js:43761
onResponse @ workbench.desktop.main.js:43761
onBuffer @ workbench.desktop.main.js:43761
(anonymous) @ workbench.desktop.main.js:43760
_deliver @ workbench.desktop.main.js:55
_deliverQueue @ workbench.desktop.main.js:55
fire @ workbench.desktop.main.js:55
ne @ workbench.desktop.main.js:53
emit @ VM4 sandbox_bundle:2
onMessage @ VM4 sandbox_bundle:2
workbench.desktop.main.js:64 ERR Extension host (LocalProcess [role: retrieval-always-local] pid: 23060) terminated unexpectedly. The following extensions were running: anysphere.cursor-always-local, anysphere.cursor-resolver, anysphere.cursor-retrieval
error @ workbench.desktop.main.js:64
error @ workbench.desktop.main.js:64
error @ workbench.desktop.main.js:48653
_logExtensionHostCrash @ workbench.desktop.main.js:49748
_onExtensionHostCrashed @ workbench.desktop.main.js:49753
_onExtensionHostCrashOrExit @ workbench.desktop.main.js:49748
(anonymous) @ workbench.desktop.main.js:49748
_deliver @ workbench.desktop.main.js:55
fire @ workbench.desktop.main.js:55
_onExtHostProcessExit @ workbench.desktop.main.js:49752
(anonymous) @ workbench.desktop.main.js:49752
_deliver @ workbench.desktop.main.js:55
fire @ workbench.desktop.main.js:55
l @ workbench.desktop.main.js:43761
onResponse @ workbench.desktop.main.js:43761
onBuffer @ workbench.desktop.main.js:43761
(anonymous) @ workbench.desktop.main.js:43760
_deliver @ workbench.desktop.main.js:55
_deliverQueue @ workbench.desktop.main.js:55
fire @ workbench.desktop.main.js:55
ne @ workbench.desktop.main.js:53
emit @ VM4 sandbox_bundle:2
onMessage @ VM4 sandbox_bundle:2
workbench.desktop.main.js:46676 [ext_host_cursor] Extension host crashed undefined {arch: ‘x64’, platform: ‘win32’, channel: ‘stable’, client_version: ‘2.6.18’, code: 18446744072635810000, …}
error @ workbench.desktop.main.js:46676
_onExtensionHostCrashed @ workbench.desktop.main.js:49753
_onExtensionHostCrashOrExit @ workbench.desktop.main.js:49748
(anonymous) @ workbench.desktop.main.js:49748
_deliver @ workbench.desktop.main.js:55
fire @ workbench.desktop.main.js:55
_onExtHostProcessExit @ workbench.desktop.main.js:49752
(anonymous) @ workbench.desktop.main.js:49752
_deliver @ workbench.desktop.main.js:55
fire @ workbench.desktop.main.js:55
l @ workbench.desktop.main.js:43761
onResponse @ workbench.desktop.main.js:43761
onBuffer @ workbench.desktop.main.js:43761
(anonymous) @ workbench.desktop.main.js:43760
_deliver @ workbench.desktop.main.js:55
_deliverQueue @ workbench.desktop.main.js:55
fire @ workbench.desktop.main.js:55
ne @ workbench.desktop.main.js:53
emit @ VM4 sandbox_bundle:2
onMessage @ VM4 sandbox_bundle:2
workbench.desktop.main.js:48641 Extension host terminated unexpectedly 3 times within the last 5 minutes.
onDidChangeNotification @ workbench.desktop.main.js:48641
(anonymous) @ workbench.desktop.main.js:48641
_deliver @ workbench.desktop.main.js:55
_deliverQueue @ workbench.desktop.main.js:55
fire @ workbench.desktop.main.js:55
addNotification @ workbench.desktop.main.js:45754
notify @ workbench.desktop.main.js:46613
prompt @ workbench.desktop.main.js:46613
_onExtensionHostCrashed @ workbench.desktop.main.js:49753
_onExtensionHostCrashOrExit @ workbench.desktop.main.js:49748
(anonymous) @ workbench.desktop.main.js:49748
_deliver @ workbench.desktop.main.js:55
fire @ workbench.desktop.main.js:55
_onExtHostProcessExit @ workbench.desktop.main.js:49752
(anonymous) @ workbench.desktop.main.js:49752
_deliver @ workbench.desktop.main.js:55
fire @ workbench.desktop.main.js:55
l @ workbench.desktop.main.js:43761
onResponse @ workbench.desktop.main.js:43761
onBuffer @ workbench.desktop.main.js:43761
(anonymous) @ workbench.desktop.main.js:43760
deliver @ workbench.desktop.main.js:55
deliverQueue @ workbench.desktop.main.js:55
fire @ workbench.desktop.main.js:55
ne @ workbench.desktop.main.js:53
emit @ VM4 sandbox_bundle:2
onMessage @ VM4 sandbox_bundle:2
workbench.desktop.main.js:64 WARN [MainThreadCursor] Failed to flush aggregating provider batch Canceled: Canceled
at ybe (workbench.desktop.main.js:28:2426)
at workbench.desktop.main.js:46616:18900
at Array.forEach ()
at ZDt.dispose (workbench.desktop.main.js:46616:18741)
at tOa.dispose (workbench.desktop.main.js:46620:9663)
at zw.dispose (workbench.desktop.main.js:49748:13932)
at jw.stopAllInReverse (workbench.desktop.main.js:49748:13066)
at async Mid._doStopExtensionHosts (workbench.desktop.main.js:49747:78673)
warn @ workbench.desktop.main.js:64
warn @ workbench.desktop.main.js:64
warn @ workbench.desktop.main.js:48653
onError @ workbench.desktop.main.js:43779
(anonymous) @ workbench.desktop.main.js:43779
Promise.then
catch @ workbench.desktop.main.js:46616
flush @ workbench.desktop.main.js:43779
(anonymous) @ workbench.desktop.main.js:43779
setTimeout
e.setTimeout @ workbench.desktop.main.js:46067
add @ workbench.desktop.main.js:43779
distribution @ workbench.desktop.main.js:43779
distribution @ workbench.desktop.main.js:34272
_emitIpcMetrics @ workbench.desktop.main.js:43779
_tracedAsyncIpc @ workbench.desktop.main.js:43779
await in _tracedAsyncIpc
$getMcpLeasePrompts @ workbench.desktop.main.js:43779
_doInvokeHandler @ workbench.desktop.main.js:46616
_invokeHandler @ workbench.desktop.main.js:46616
_receiveRequest @ workbench.desktop.main.js:46616
_receiveOneMessage @ workbench.desktop.main.js:46616
(anonymous) @ workbench.desktop.main.js:46616
_deliver @ workbench.desktop.main.js:55
fire @ workbench.desktop.main.js:55
fire @ workbench.desktop.main.js:43761
(anonymous) @ workbench.desktop.main.js:49752
workbench.desktop.main.js:50075 [TerminalExecutionServiceProxy] v3 health check failed after 45012ms: Error: Command execution timeout
at workbench.desktop.main.js:50075:5970
_healthCheckV3 @ workbench.desktop.main.js:50075
workbench.desktop.main.js:64 ERR [MainThreadShellExec] Error disposing session 6b6e2784-4bff-4708-878b-aa3b4320d94c: Canceled: Canceled
at new eEw (workbench.desktop.main.js:46616:16806)
at ZDt._remoteCall (workbench.desktop.main.js:46616:23489)
at r..s.charCodeAt.r. (workbench.desktop.main.js:46616:20100)
at eTt.disposeSession (workbench.desktop.main.js:43779:130280)
at TRu.disposeSession (workbench.desktop.main.js:43779:132161)
at Osd._healthCheckV3 (workbench.desktop.main.js:50075:4699)
at async Osd._updateDelegateBasedOnSettings (workbench.desktop.main.js:50075:6809)
error @ workbench.desktop.main.js:64
error @ workbench.desktop.main.js:64
error @ workbench.desktop.main.js:48653
disposeSession @ workbench.desktop.main.js:43779
await in disposeSession
disposeSession @ workbench.desktop.main.js:43779
_healthCheckV3 @ workbench.desktop.main.js:50075
workbench.desktop.main.js:50075 [TerminalExecutionServiceProxy] Cannot switch to v3: health check failed
_updateDelegateBasedOnSettings @ workbench.desktop.main.js:50075
workbench.desktop.main.js:50075 [TerminalExecutionServiceProxy] v3 health check failed after 45009ms: Error: Command execution timeout
at workbench.desktop.main.js:50075:5970
_healthCheckV3 @ workbench.desktop.main.js:50075
workbench.desktop.main.js:64 ERR [MainThreadShellExec] Error disposing session fed616aa-ea60-4f74-a9d7-16bb4027d4ca: Canceled: Canceled
at new eEw (workbench.desktop.main.js:46616:16806)
at ZDt._remoteCall (workbench.desktop.main.js:46616:23489)
at r..s.charCodeAt.r. (workbench.desktop.main.js:46616:20100)
at eTt.disposeSession (workbench.desktop.main.js:43779:130280)
at TRu.disposeSession (workbench.desktop.main.js:43779:132161)
at Osd._healthCheckV3 (workbench.desktop.main.js:50075:4699)
at async Osd._updateDelegateBasedOnSettings (workbench.desktop.main.js:50075:6809)
error @ workbench.desktop.main.js:64
error @ workbench.desktop.main.js:64
error @ workbench.desktop.main.js:48653
disposeSession @ workbench.desktop.main.js:43779
await in disposeSession
disposeSession @ workbench.desktop.main.js:43779
_healthCheckV3 @ workbench.desktop.main.js:50075
workbench.desktop.main.js:50075 [TerminalExecutionServiceProxy] Cannot switch to v3: health check failed
_updateDelegateBasedOnSettings @ workbench.desktop.main.js:50075
workbench.desktop.main.js:46883 Failed to flush analytics events: Canceled: Canceled
at t (workbench.desktop.main.js:43779:43827)
at workbench.desktop.main.js:43779:45277
at rkc (workbench.desktop.main.js:61:56243)
at Ube (workbench.desktop.main.js:61:56204)
at Object.unary (workbench.desktop.main.js:43779:45221)
at Object.batch (workbench.desktop.main.js:34078:4394)
at d5u.flushAll (workbench.desktop.main.js:46883:1387)
flushAll @ workbench.desktop.main.js:46883
await in flushAll
(anonymous) @ workbench.desktop.main.js:46882
workbench.desktop.main.js:48620 Canceled: Canceled
at t (workbench.desktop.main.js:43779:43827)
at workbench.desktop.main.js:43779:45277
at rkc (workbench.desktop.main.js:61:56243)
at Ube (workbench.desktop.main.js:61:56204)
at Object.unary (workbench.desktop.main.js:43779:45221)
at Object.markPrivacy (workbench.desktop.main.js:34078:4394)
at Tfa.initialRetryTimeMs (workbench.desktop.main.js:48620:22930)
at async Tfa (workbench.desktop.main.js:34157:610293)
at async workbench.desktop.main.js:48620:22478
(anonymous) @ workbench.desktop.main.js:48620
await in (anonymous)
oc @ workbench.desktop.main.js:131
(anonymous) @ workbench.desktop.main.js:48620
(anonymous) @ workbench.desktop.main.js:34157
setTimeout
e.setTimeout @ workbench.desktop.main.js:46067
(anonymous) @ workbench.desktop.main.js:34157
sendPrivacySettings @ workbench.desktop.main.js:48621
(anonymous) @ workbench.desktop.main.js:48620
_deliver @ workbench.desktop.main.js:55
_deliverQueue @ workbench.desktop.main.js:55
fire @ workbench.desktop.main.js:55
registerConnectTransportProvider @ workbench.desktop.main.js:34157
$registerAiConnectTransportProvider @ workbench.desktop.main.js:43779
_doInvokeHandler @ workbench.desktop.main.js:46616
_invokeHandler @ workbench.desktop.main.js:46616
_receiveRequest @ workbench.desktop.main.js:46616
_receiveOneMessage @ workbench.desktop.main.js:46616
(anonymous) @ workbench.desktop.main.js:46616
_deliver @ workbench.desktop.main.js:55
fire @ workbench.desktop.main.js:55
fire @ workbench.desktop.main.js:43761
(anonymous) @ workbench.desktop.main.js:49752

Does this stop you from using Cursor

Yes - Cursor is unusable

deanrie · March 11, 2026, 3:36pm

Hey, thanks for the report. This is a known issue with the retrieval-always-local extension host, and we’re seeing it for several users on the latest versions.

Your logs look typical. It’s a native crash in the extension host with code 18446744072635810000, and @anysphere/context also isn’t resolving. Let’s try a few things:

Turn off Codebase Indexing:
Cursor Settings (not VS Code settings) > Indexing & Docs > turn off Codebase Indexing. If you see Index Repositories for Instant Grep (BETA), turn that off too. Then restart Cursor.

I know you said you’re not even opening a folder, but indexing can still try to use data from previous sessions.

If that doesn’t help, try a temporary profile:

cursor --profile-temp

This will start Cursor with a clean state. If it works there, the issue is likely a corrupted state.

If it still crashes with the temp profile, check cursor-socket:
Open Command Prompt and run:

dir "%LOCALAPPDATA%\Programs\cursor\resources\app\extensions\cursor-socket\"

Send the output here. For another Windows user, the issue was that the out/ folder was missing inside cursor-socket.

Let me know what helped, or what didn’t.

Brian_Walch · March 11, 2026, 6:11pm

Thanks for the quick reply. I had turned off Index New Folders and verified it is off. I also had turned off Index Repositories for Instant Grep, but it keeps reverting to on (just fyi). I started Cursor with a temp profile, and had the same issue. When I did a fresh install, I used the system installer, as someone indicated that could fix the issue. I don’t have a %LOCALAPPDATA%\Programs\cursor\resources\app\extensions\cursor-socket\ folder.

The contents of my C:\Program Files\cursor\resources\app\extensions\cursor-socket are:

package (JSON source file)
extension.webpack.config.js
dist\main.js

Is that helpful and the information you were looking for?

Brian_Walch · March 12, 2026, 1:56am

I did a clean reinstall of version 2.6.14, and the user version. Same results all around.

Wesley_Diogo · March 12, 2026, 7:46pm

I’m facing the same problem. I’ve already tried everything I could: cleared the cache, installed previous versions, etc., and nothing makes Cursor work. It’s unusable.

Brian_Walch · March 13, 2026, 12:59pm

Any updates? I’m holding out hope someone has a solution. I updated to 2.6.19 and cleaned out things again, opened in temp profile, and same issue. Cursor is still unusable.

This isn’t happening on my other machine, so it is something about the install on this machine that the uninstall isn’t cleaning up. Happy to provide more info if it will support getting a resolution.

Brian_Walch · March 15, 2026, 6:21pm

Okay, in case it’s helpful, I uninstalled a couple VPNs. I had installed them for a trip and even though they weren’t running, I was trying to remove any potential issues. My initial cursor use this morning (clean install of .19) is that the extension host isn’t crashing. Fingers crossed!

system · April 16, 2026, 5:41am

This topic was automatically closed 22 days after the last reply. New replies are no longer allowed.

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