Where does the bug appear (feature/product)? Cursor IDE Describe the Bug Summary Extensions cannot be installed inside a devcontainer running on linux-arm64. Both the marketplace UI install and CLI --install-extension fail with the same error. The root cause is a missing node-ovsx-sign module in th…

Confirming that I am seeing the same issue with Cursor 2.5.20 and wanted to shout out that this is a wonderful bug report @acamp tyty

I agree with @dannyp — you should teach lessons @acamp ! Signature verification is new in Cursor (and I thought, still disabled behind a feature flag), and we probably missed something here. I’ll send it directly to the team.

:laughing: Thank you guys. As much as I’d like to take the accolades here, it was all Cursor doing the digging. I just pointed it to the right place and let it cook :cook: Thanks for looking into this!

Confirmed the same thing happening in Cursor 2.5. Downgrading to 2.4 solved the issue. This must be addressed!

Hey there! I believe a fix was merged into 2.5.21 (the latest version is 2.5.26 right now). Could you please give it a try? It’s a bit tough as we haven’t been able to reproduce it internally, but we’re pretty confident that we fixed it.

Looks like it’s fixed!! Thank you very much @Colin

Can confirm it is working! Thank you all!

Extensions Fail to Install in Dev Containers (confirmed linux-arm64, may affect other architectures)

Support Bug Reports

Topic		Replies	Views
Launching with devcontainer failed to install cursor-server Bug Reports installation , wsl , devcontainers	14	820	June 8, 2026
Unable to install ms-remote-containers extension Bug Reports	13	962	August 15, 2025
Devcontainers still 100% broken on latest cursor - suggestions? Bug Reports wsl , devcontainers , windows	7	470	February 25, 2026
Cursor marketplace installs/offers outdated version of Open VSX extension despite latest version being available upstream Bug Reports extensions , marketplace , linear-linked	6	169	May 13, 2026
Anysphere Dev Container Regression Bug Reports	1	329	August 9, 2025

Extensions Fail to Install in Dev Containers (confirmed linux-arm64, may affect other architectures)

Related topics