# HDF5 1.12.2-3-rc-1 source available for testing

**URL:** <https://forum.hdfgroup.org/t/hdf5-1-12-2-3-rc-1-source-available-for-testing/9666>\
**Category:** News and Announcements\
**Created:** [April 13, 2022, 4:00pm UTC](https://forum.hdfgroup.org/t/hdf5-1-12-2-3-rc-1-source-available-for-testing/9666 "2022-04-13T16:00:06Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![lrknox](https://forum.hdfgroup.org/letter_avatar_proxy/v4/letter/l/bc8723/32.png) [@lrknox](https://forum.hdfgroup.org/u/lrknox)\
**Post date:** [April 13, 2022, 4:00pm UTC](https://forum.hdfgroup.org/t/hdf5-1-12-2-3-rc-1-source-available-for-testing/9666/1 "2022-04-13T16:00:06Z")

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Hello everyone!

A pre-release version of HDF5 1.12.2 source (hdf5-1.12.2-3-rc1) is available for testing and can be downloaded at the following link:  
[https://gamma.hdfgroup.org/ftp/pub/outgoing/hdf5](https://gamma.hdfgroup.org/ftp/pub/outgoing/hdf5).

**This release contains new features and changes from active HDF5 development that are compatible with hdf5\_1\_12:**

• Parallel Compression improvements described in the [Parallel compression improvements in HDF5 1.13.1 blog post](https://www.hdfgroup.org/2022/03/parallel-compression-improvements-in-hdf5-1-13-1/) are also included in the HDF5 1.12.2 release.

• Version checking for run-time compatibility will now allow applications built with earlier HDF5 1.12.x versions to run without setting the environment variable to allow it.

• Functions to get and set ULL attributes were added to the high-level API.

• Two CVE issues were addressed in this release. generally related to malformed files that crash the HDF5 library.

- CVE-2018-17432
- CVE-2020-10810

These issues are being addressed as they arise.

• Several other CVE issues have not been addressed in this release, but can be avoided with new configure options to disable building High-Level tools. These three CVE issues will be avoided by not building the gif tools using --disable-tools for autotools or HDF5\_BUILD\_HL\_TOOLS=OFF for cmake:

- CVE-2018-17433
- CVE-2018-17436
- CVE-2020-10809

• HDF5 now requires Visual Studio 2015 or greater; work-around code and definitions for older Visual Studio version have been removed. Note that, by the end of the year, support for VS 2015 will be dropped.

• HDF5 is now tested and supported on macOS 11.6 M1.

For details about these and other changes or more information about the release see [https://gamma.hdfgroup.org/ftp/pub/outgoing/hdf5/hdf5-1.12.2-3-RELEASE.txt](https://gamma.hdfgroup.org/ftp/pub/outgoing/hdf5/hdf5-1.12.2-3-RELEASE.txt).

If you have time to test this release candidate, we would greatly appreciate it. We test HDF5 on a variety of platforms and with multiple compilers, but there is always a system that we couldn’t test on. Your feedback is critical.

For those who use autoconf to build HDF5, please notice that the default configuration mode for this distribution is “–enable-build-mode=production". Use the “–enable-build-mode=debug” configure flag if you want to build HDF5 in the debug mode. Testing in both modes is recommended when possible.

The shared library version numbers for lib.so.\* files in HDF5-1.12.2-3 have been updated according to libtool’s versioning system and the changes in symbols from HDF5-1.12.1. The API compatibility report is at this link: [hdf5-1.12.2-3-rc1-vs-hdf5-1.12.1-interface\_compatibility\_report](https://gamma.hdfgroup.org/ftp/pub/outgoing/hdf5/hdf5-1.12.2-3-rc1-vs-hdf5-1.12.1-interface_compatibility_report.html)

Reports of issues in the will be invaluable and very much appreciated. Thank you, and happy testing!

Larry Knox  
The HDF Group