Announcing macFUSE 5.2.0

Announcing macFUSE 5.2.0 Posted on 09 Apr 2026

Download macFUSE 5.2.0 macOS 12 or later Apple Silicon or Intel SHA-256: 09a4b4c23c1930af45335fc119696797da41562dec1630602d2db637f4804f27

Release Notes

General

Update build process to use Xcode 26.4 (macOS 26.4 SDK)
Introduce a new open source API for mounting volumes using the FSKit backend. The new API enables fully sandboxed file systems, which was not previously possible.
- The actual mount operation is performed over XPC. This means the FSKit backend does no longer rely on fork()/exec() to mount volumes.
- The new API is already used by libfuse and libfuse3
- When sandboxing your file system server, add a Mach lookup exception for the io.macfuse.mount service
- The new MFMount.framework is located in /Library/Filesystems/macfuse.fs/Contents/Frameworks
- Please note that the new API may change in future releases

`FSModule` (`FSKit` Backend)

Add support for a file system item’s allocation size. Sparse files are not currently supported, so the value of this attribute is the item’s size.
Add a workaround for an FSKit/PluginKit issue that could prevent macFUSE volumes from being mounted after re-registering an already registered file system extension, requiring a restart of the FSKit subsystem.
Remove the obsolete broker launch daemon io.macfuse.app.launchservice.broker, which was previously used to establish a connection between the file system extension and the file system server.

Improve the built-in log command to detect whether the output destination supports colored output. This is useful when piping log output to a file.

% /Library/Filesystems/macfuse.fs/Contents/Resources/macfuse.app/Contents/MacOS/macfuse log stream
Executing /usr/bin/log stream --debug --info --predicate "subsystem in { 'com.apple.FSKit', 'com.apple.LiveFS', 'io.macfuse' }" --color always
Filtering the log data using "subsystem IN {"com.apple.FSKit", "com.apple.LiveFS", "io.macfuse"}"
...

Improve the built-in install command to support selecting which components to install. Supported options are privileged-helpers, file-system-extensions, and all. Omitting the component is equivalent to specifying all.

% /Library/Filesystems/macfuse.fs/Contents/Resources/macfuse.app/Contents/MacOS/macfuse install --help  
USAGE: macfuse install [--components <components> ...] [--force]

OPTIONS:
  -c, --components <components>
                          Components to install (default: all)
  -f, --force
  -h, --help              Show help information.

Introduce foundational changes in preparation for new features in macFUSE 5.3

`libfuse2`

Use new mount API MFMount.framework for mounting volumes using the FSKit Backend backend

`libfuse3`

Update libfuse3 to version 3.18.2
Use new mount API MFMount.framework for mounting volumes using the FSKit Backend backend
Fix a bug when handling FUSE_RENAME messages with FUSE_DARWIN_CAP_RENAME_EXT enabled that could cause the source and destination file names to be parsed incorrectly.

macFUSE
File system integration made easy