Download musl

Git repository

The latest musl source is always available via the git revision control system. Efforts are made to keep the master branch in a state that not only compiles and works, but that works at least as well or better than the latest release.

The following command can be used to checkout a copy of the musl git repository:

$ git clone git://

Source and revision history are also browsable online via cgit.

Official releases

musl generally follows a time-based release cycle, with versions spaced roughly one to three months apart. Version numbering, however, is based on an evolving roadmap for particular compatibility and feature goals. Releases are timed so as to make fixes for major bugs available in release form as soon as possible while leaving ample time for testing after significant invasive changes.

Beginning with 1.1.7, releases are signed with the project GPG key. Its fingerprint is 8364 8929 0BB6 B70F 99FF DA05 56BC DB59 3020 450F and can be cross-checked against @musllibc on Twitter.

See below for release notes summaries and download links.

Current Versions

Mainline - 1.1.17

This series is actively developed but intended for use in production environments as long as appropriate testing is performed.

musl-1.1.17.tar.gz (sig) - October 19, 2017

This release fixes numerous bugs affecting visible behavior and safety/internal consistency, including a stack-based buffer overflow in dns parsing and multiple sources of invalid memory accesses that may lead to crashes. See the release notes in WHATSNEW for details.

Many new features have also been added, including deferred symbol binding in the dynamic linker (RTLD_LAZY emulation), an option to overrid argv[0] when running ldso to execute a program, support for starting new sessions via posix_spawn (POSIX_SPAWN_SETSID, accepted for standardization), and ability to query the active thread-local locale (via _NL_LOCALE_NAME extension). Improvements in compatibility with applications, build tools, and platforms have also been made.

Older versions

Earlier versions of musl have been moved to a separate page.