OTP 23.1 has been released

OTP 23.1 Readme File

OTP 23.1 Source File (248)

OTP 23.1 Windows 32-bit Binary File (248)

OTP 23.1 Windows 64-bit Binary File (248)

OTP 23.1 HTML Documentation File (248)

OTP 23.1 Man Pages File (248)

OTP 23.1

Erlang/OTP 23.1 is a the first maintenance patch release for OTP 23, with mostly bug fixes as well as a few improvements.

Vulnerability fix

A vulnerability in the httpd module (inets application) regarding directory traversal that was introduced in OTP 22.3.1 and corrected in OTP It was also introduced in OTP 23.0 and corrected in OTP 23.1 The vulnerability is registered as CVE-2020-25623.
The vulnerability is only exposed if the http server (httpd) in the inets application is used. The vulnerability makes it possible to read arbitrary files which the Erlang system has read access to with for example a specially prepared http request.

General build issues

Adjust /bin/sh to /system/bin/sh in scripts when installing on Android.
Changes in build system to make it build for macOS 11.0 with Apple Silicon. Also corrected execution of match specs to work on Apple Silicon.

Full list of bug fixes and improvements in the readme.

Online documentation can be browsed here:
The Erlang/OTP source can also be found at GitHub on the official Erlang repository,

Compiling Erlang from source

You can build Erlang from source on your own, following the building and installation instructions. Or use the Kerl script. Kerl is a script that lets you easily build Erlang with a few commands. Follow the instructions to build.

Source Versions and Windows Binaries for Patches

Information about all released OTP versions since OTP 17.0 can be found at the OTP Versions Tree page. This information includes a link to the GitHub source tag, and a link to the README. As of OTP 23, Windows binaries can also be downloaded from here for all patches.

Pre-built Binary Packages

Most OS package managers provide pre-built binary packages. You can also download the latest stable releases from Erlang Solutions. Erlang Solutions provides pre-built binary packages for OS X, Windows, Ubuntu, Debian, Fedora, CentOS, Raspbian and other operating systems. 

  • For Homebrew on OS X: brew install erlang
  • For MacPorts on OS X: port install erlang
  • For Ubuntu and Debianapt-get install erlang
  • For Fedorayum install erlang
  • For FreeBSDpkg install erlang


Since OTP 18.0, Erlang/OTP is released under Apache License 2.0. The older releases prior to 18.0 were released under Erlang Public License (EPL), a derivative work of the Mozilla Public License (MPL).