Erlang/OTP 27.3.4.2

This release of Erlang/OTP can be built from source or installed using pre-built packages for your OS or third-party tools (such as kerl, asdf or mise).

docker run -it erlang:27.3.4.2
Erlang/OTP 27.3.4.2
View on github.com
Patch Package OTP 27.3.4.2
Git Tag OTP-27.3.4.2
Date 2025-07-17
Issue Id
ERIERL-1240
ERIERL-1241
ERIERL-1242
System OTP
Release 27
Application

asn1-5.3.4.2 #

The asn1-5.3.4.2 application can be applied independently of other applications on a full OTP 27 installation.

OTP-19681
Related Id(s):

PR-9949

Decoding a constrained BIT STRING using JER was broken.

Full runtime dependencies of asn1-5.3.4.2

erts-14.0, kernel-9.0, stdlib-5.0

compiler-8.6.1.1 #

The compiler-8.6.1.1 application can be applied independently of other applications on a full OTP 27 installation.

OTP-19711
Related Id(s):

GH-10047, PR-10048

Fixed a bug that could cause empty bitstring matches to always succeed, even when they should not.

Full runtime dependencies of compiler-8.6.1.1

crypto-5.1, erts-13.0, kernel-8.4, stdlib-6.0

erts-15.2.7.1 #

The erts-15.2.7.1 application can be applied independently of other applications on a full OTP 27 installation.

OTP-19683
Related Id(s):

GH-9884, GH-9992, PR-9887

Fix windows uninstall command.

OTP-19710
Related Id(s):

PR-10039

The maximum amount of connections for epmd on Windows platforms has been increased from 64 to 1024.

Full runtime dependencies of erts-15.2.7.1

kernel-9.0, sasl-3.3, stdlib-4.1

kernel-10.2.7.2 #

Note! The kernel-10.2.7.2 application cannot be applied independently of other applications on an arbitrary OTP 27 installation.

   On a full OTP 27 installation, also the following runtime
   dependency has to be satisfied:
   -- erts-15.2.5 (first satisfied in OTP 27.3.2)
OTP-19661

socket:sendv/3 with ‘nowait’ sometimes return ‘completion’ without ‘CompletionInfo’ (Windows only).

OTP-19684
Related Id(s):

ERIERL-1242

socket:accept can return unexpected ‘select_sent’.

OTP-19702
Related Id(s):

ERIERL-1241, PR-10029

net_kernel could be blocked for a very long time when selecting distribution module for a connection if the DNS service was slow. This prevented any new connections to be set up during that time.

OTP-19670
Related Id(s):

PR-9930

Improved documentation of CompletionStatus for asynchronous (nowait) socket operations.

Full runtime dependencies of kernel-10.2.7.2

crypto-5.0, erts-15.2.5, sasl-3.0, stdlib-6.0

public_key-1.17.1.1 #

The public_key-1.17.1.1 application can be applied independently of other applications on a full OTP 27 installation.

OTP-19699
Related Id(s):

GH-9632, PR-10023

Handle certificates that are signed with RSASSA-PSS but the PSS params are specified in the ‘SignatureAlgorithm’ of the signed cert and not in the signer’s ‘SubjectPublicKeyInfo’.

Full runtime dependencies of public_key-1.17.1.1

asn1-5.0, crypto-5.0, erts-13.0, kernel-8.0, stdlib-4.0

ssh-5.2.11.2 #

The ssh-5.2.11.2 application can be applied independently of other applications on a full OTP 27 installation.

OTP-19691
Related Id(s):

PR-10003

Fix file handle id generation.

OTP-19707
Related Id(s):

GH-9655, PR-10035, PR-10036

Fixes a badmatch error, when SFTP operation cannot be processed due to channel closed in parallel.

Full runtime dependencies of ssh-5.2.11.2

crypto-5.0, erts-14.0, kernel-9.0, public_key-1.6.1, runtime_tools-1.15.1, stdlib-5.0, stdlib-6.0

ssl-11.2.12.2 #

Note! The ssl-11.2.12.2 application cannot be applied independently of other applications on an arbitrary OTP 27 installation.

   On a full OTP 27 installation, also the following runtime
   dependency has to be satisfied:
   -- public_key-1.16.4 (first satisfied in OTP 27.1.3)
OTP-19697
Related Id(s):

GH-10007, PR-10016

Improve error message for bad arguments to underlying connect.

OTP-19688
Related Id(s):

PR-9843

Allow the PSK identity to be the empty string in TLS-1.2 for compatibility reasons. It is allowed according to the spec although providing a proper value makes more sense.

Full runtime dependencies of ssl-11.2.12.2

crypto-5.0, erts-15.0, inets-5.10.7, kernel-9.0, public_key-1.16.4, runtime_tools-1.15.1, stdlib-6.0

stdlib-6.2.2.2 #

The stdlib-6.2.2.2 application can be applied independently of other applications on a full OTP 27 installation.

OTP-19673
Related Id(s):

ERIERL-1240

A set of small bugs in sort stability for `lists:sort/1` and `lists:keysort/1` has been fixed. The bug happened for only some, seemingly random, element sequences. Most sorts were stable.

Sort stability for `lists:sort/1` is only possible to observe when sorting lists with floating point and integer numbers of the same value.

For `lists:keysort/1` the list had to start with two tuples where the keys or the whole tuples compared equal.

Full runtime dependencies of stdlib-6.2.2.2

compiler-5.0, crypto-4.5, erts-15.0, kernel-10.0, sasl-3.0

Thanks To #

Thanks to

Dmytro Lytovchenko

GH-10007: https://github.com/erlang/otp/issues/10007 GH-10047: https://github.com/erlang/otp/issues/10047 GH-9632: https://github.com/erlang/otp/issues/9632 GH-9655: https://github.com/erlang/otp/issues/9655 GH-9884: https://github.com/erlang/otp/issues/9884 GH-9992: https://github.com/erlang/otp/issues/9992 PR-10003: https://github.com/erlang/otp/pull/10003 PR-10016: https://github.com/erlang/otp/pull/10016 PR-10023: https://github.com/erlang/otp/pull/10023 PR-10029: https://github.com/erlang/otp/pull/10029 PR-10035: https://github.com/erlang/otp/pull/10035 PR-10036: https://github.com/erlang/otp/pull/10036 PR-10039: https://github.com/erlang/otp/pull/10039 PR-10048: https://github.com/erlang/otp/pull/10048 PR-9843: https://github.com/erlang/otp/pull/9843 PR-9887: https://github.com/erlang/otp/pull/9887 PR-9930: https://github.com/erlang/otp/pull/9930 PR-9949: https://github.com/erlang/otp/pull/9949