# cmux 0.64.9: 0.64.8 Memory Leak Hotfix

[ Changelog](https://cmux.com/docs/changelog)


May 21, 2026

### Fix 8GB RSS Growth on Non-Git Workspaces

Git repository search now stops at filesystem root instead of walking forever into \`/..\`. On older Foundation builds, \`deletingLastPathComponent()\` could yield \`/..\` and keep climbing, allocating ever-longer parent paths until the OS OOM killer fired. Non-Git workspaces no longer grow RSS from ~450MB to 8GB within minutes on 0.64.8.

### Restore Browser Memory Saver Default

Hidden browser webview renderers discard by default again, reverting the 0.64.8 keep-alive default that exposed the memory regression. The keep-alive behavior remains available as an opt-in setting for workflows that need to preserve DOM state across workspace switches.

Fixed

-   Stop unbounded Git repository search past filesystem root so non-Git workspaces no longer grow RSS from ~450MB to 8GB and trigger the OOM killer ([#4557](https://github.com/manaflow-ai/cmux/pull/4557)) -- thanks @Luciferxie for the report!
-   Restore the Browser Memory Saver default to on (discards hidden browser webview renderers after the discard delay) to mitigate the 0.64.8 memory regression ([#4545](https://github.com/manaflow-ai/cmux/pull/4545)) -- thanks @Luciferxie for the report!

Contributors

[![austinywang](https://cmux.com/_next/image?url=https%3A%2F%2Fgithub.com%2Faustinywang.png%3Fsize%3D48&w=48&q=75)austinywang](https://github.com/austinywang) [![lawrencecchen](https://cmux.com/_next/image?url=https%3A%2F%2Fgithub.com%2Flawrencecchen.png%3Fsize%3D48&w=48&q=75)lawrencecchen](https://github.com/lawrencecchen) [![Luciferxie](https://cmux.com/_next/image?url=https%3A%2F%2Fgithub.com%2FLuciferxie.png%3Fsize%3D48&w=48&q=75)Luciferxie](https://github.com/Luciferxie)

[ cmux 0.64.8](https://cmux.com/docs/changelog/0.64.8) [cmux 0.64.10 ](https://cmux.com/docs/changelog/0.64.10)

Canonical: https://cmux.com/docs/changelog/0.64.9

Documentation index: https://cmux.com/llms.txt