0MQ version 4.3.2 stable, released on 2019/07/08

• CVE-2019-13132: a remote, unauthenticated client connecting to a libzmq application, running with a socket listening with CURVE encryption/authentication enabled, may cause a stack overflow and overwrite the stack with arbitrary data, due to a buffer overflow in the library. Users running public servers with the above configuration are highly encouraged to upgrade as soon as possible, as there are no known mitigations. All versions from 4.0.0 and upwards are affected. Thank you Fang-Pen Lin for finding the issue and reporting it!

• New DRAFT (see NEWS for 4.2.0) zmq_socket_monitor_versioned API that supports a versioned monitoring events protocol as a parameter. Passing 1 results in the same behaviour as zmq_socket_monitor. Version 2 of the events protocol allows new events, new metadata, different socket types for the monitors and more. It is described in details in doc/zmq_socket_monitor_versioned.txt

• New DRAFT (see NEWS for 4.2.0) zmq_socket_monitor_pipes_stats that triggers a new ZMQ_EVENT_PIPES_STATS to be delivered via zmq_socket_monitor_versioned v2 API, which contains the current status of all the queues owned by the monitored socket. See doc/zmq_socket_monitor_versioned.txt for details.

• New DRAFT (see NEWS for 4.2.0) zmq_poller_fd that returns the FD of a thread safe socket. See doc/zmq_poller.txt for details.

• New DRAFT (see NEWS for 4.2.0) socket options:

• ZMQ_XPUB_MANUAL_LAST_VALUE is similar to ZMQ_XPUB_MANUAL but allows to avoid duplicates when using last value caching.

• ZMQ_SOCKS_USERNAME and ZMQ_SOCKS_PASSWORD that implement SOCKS5 proxy authentication. See doc/zmq_setsockopt.txt and doc/zmq_getsockopt.txt for details.

• Implemented background thread names for Windows, when the Visual Studio debugger is being used.

• Fixed [#3358] - test_security_zap failing due to SIGBUS on SPARC64, hard-coded IPC socket binds in tests cause race conditions

• Fixed [#3361] - enabling GSSAPI support (when using autools) does not work due to regression introduced in 4.2.3

• Fixed [#3362] - remove documentation for ZMQ_THREAD_PRIORITY context option getter, it's not implemented

• Fixed [#3363] - tests fail to build due to stricter compiler printf validation in new versions of GCC

• Fixed [#3367] - try to infer cacheline size at build time, first with getconf LEVEL1_DCACHE_LINESIZE, and then by reading /sys/devices/system/cpu/cpu0/cache/index0/coherency_line_size (autoconf only), and only then falling back to the previous default of 64 bytes. Avoids false sharing on POWER and s390x. Import ax_func_posix_memalign.m4 as a more reliable check for posix_memalign presence on some unix platforms. Prefer c++11 atomic primitives to compiler intrinsics, when both are available, as the former is more reliable. Set test_pair_ipc and test_rebind_ipc to XFAIL on GNU/Hurd due to non-functioning getsockname on AF_UNIX.

• Fixed [#3370] - Make queue length and HWM state observable

• Fixed [#3373] - performance regression in zmq_poll on CentOS 6/7

• Fixed [#3375] - assign names to all pthreads created by the library to ease debugging

• Fixed [#3376] - assigned random TIPC port is not returned by ZMQ_LAST_ENDPOINT

• Fixed [#3385] - TCP port in ZMQ_LAST_ENDPOINT depends on global locale

• Fixed [#3404] - use std::condition_variable_any when possible

• Fixed [#3436] - reconnect interval exponential backoff and may lead to integer overflows

• Fixed [#3440] - improve zmq_proxy performance by batching of up to 1000 consecutive messages (if any) and add perf/proxy_thr tool

• Fixed [#3451] - fix support of /dev/poll on Solaris

• Fixed [#3452] - strnlen may not be available

• Fixed [#1462] - test failure in test_filter_ipc due to invalid system groups

• Fixed [#3269] - Boost.ASIO integration stopped working with v4.3.0

• Fixed [#3479] - ZeroMQ does not build for QNX 6.6 with CMake

• Fixed [#3481] - add <ios> include to fix uClibc++ compilation

• Fixed [#3491] - build broken on Fedora 30

• Fixed [#3494] - ZeroMQConfig.cmake fails if shared libraries are not built

• Fixed [#3498] - syntax error on Windows related to socket descriptor type

• Fixed [#3500] - PLAIN HELLO message incorrectly uses WELCOME literal, regression introduced in 4.3.0

• Fixed [#3517] - configure errors because of syntax errors in the use of test shell command

• Fixed [#3521] - document how to achieve high performance with the PGM transport

• Fixed [#3526] - failure case behavior unclear in zmq_msg_send documentation

• Fixed [#3537] - fix build on z/OS by using pthread_equal instead of comparing variables directly

• Fixed [#3546] - CMake links with librt on MinGW which is not available

• Many coding style, duplication, testing and static analysis improvements.