Erlang/OTP 25.1 Release

September 21, 2022 · by Henrik Nord

OTP 25.1 #

Erlang/OTP 25.1 is the first maintenance patch package for OTP 25, with mostly bug fixes as well as quite many small improvements.

Below are some highlights of the release:

crypto: #

  • Crypto is now considered to be usable with the OpenSSL 3.0 cryptolib for production code. ENGINE and FIPS are not yet fully functional.

  • Changed the behaviour of the engine load/unload functions

ssl: #

  • A vulnerability has been discovered and corrected. It is registered as CVE-2022-37026 “Client Authentication Bypass”. Corrections have been released on the supported tracks with patches,, and 25.0.2. The vulnerability might also exist in older OTP versions. We recommend that impacted users upgrade to one of these versions or later on the respective tracks. OTP 25.1 would be an even better choice. Impacted are those who are running an ssl/tls/dtls server using the ssl application either directly or indirectly via other applications. For example via inets (httpd), cowboy, etc. Note that the vulnerability only affects servers that request client certification, that is sets the option {verify, verify_peer}.

The Erlang/OTP source can also be found at GitHub on the official Erlang repository,

Download links for this and previous versions are found here