Patch Package OTP 28.4.3 Released

[Erlang/OTP]

Patch Package:           OTP 28.4.3
Git Tag:                 OTP-28.4.3
Date:                    2026-04-21
Trouble Report Id:       OTP-20081, OTP-20086, OTP-20104
Seq num:                 #10968, CVE-2026-32147, PR-10985, PR-11027
System:                  OTP
Release:                 28
Application:             kernel-10.6.3, ssh-5.5.2
Predecessor:             OTP 28.4.2

Check out the git tag OTP-28.4.3, and build a full OTP system including
documentation. Apply one or more applications from this build as patches to your
installation using the 'otp_patch_apply' tool. For information on install
requirements, see descriptions for each application version below.

# OTP-28.4.3

## Fixed Bugs and Malfunctions

- Fix the `otp_patch_apply` script to properly handle installation of
  documentation for OTP versions with more than one digit in version parts less
  significant than the major version.

  Own Id: OTP-20086
  Related Id(s): PR-10985

# kernel-10.6.3

The kernel-10.6.3 application can be applied independently of other applications
on a full OTP 28 installation.

## Fixed Bugs and Malfunctions

- On Windows, sockets has to be bound when using 'socket'. Therefor when using
  gen_tcp with inet_backend = socket, gen_tcp_socket bind even if the caller has
  not provided an explicit bind address. In that case it attempts to locate a
  "proper" address on its own. But if the connect address is the loopback
  address, this could lead to an attempt to bind to an external interface. So,
  this has now been changed so that if the connect address is the loopback
  address, the loopback address will also be used when binding.

  Own Id: OTP-20104
  Related Id(s): #10968

> #### Full runtime dependencies of kernel-10.6.3
>
> crypto-5.0, erts-15.2.5, sasl-3.0, stdlib-7.0

# ssh-5.5.2

Note! The ssh-5.5.2 application _cannot_ be applied independently of other
applications on an arbitrary OTP 28 installation.

       On a full OTP 28 installation, also the following runtime
       dependency has to be satisfied:
       -- crypto-5.7 (first satisfied in OTP 28.1)

## Fixed Bugs and Malfunctions

- Fixed a vulnerability in the SFTP server where file attributes could be
  modified outside the configured root directory. When using FSETSTAT on an open
  file handle, the operation used the path stored in the handle without
  verifying it was within the root directory, allowing attribute changes to
  files outside the chroot boundary.

  Thanks to John Downey.

  Own Id: OTP-20081
  Related Id(s): PR-11027, CVE-2026-32147

> #### Full runtime dependencies of ssh-5.5.2
>
> crypto-5.7, erts-14.0, kernel-10.3, public_key-1.6.1, runtime_tools-1.15.1,
> stdlib-5.0, stdlib-6.0