HDFGroup/hdf5

Official HDF5® Library Repository

Stars: 986
Forks: 356
Open beginner issues: 1
Indexed issues: 321
Avg merge: 3d 4h
Merged PRs (30d): 15

Dominant language: C
License: No license data
Last GitHub push: Sep 18, 2026
Latest indexed: Sep 14, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: No beginner labels indexed

Beginner friendly Everything

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`check_required_components()` in HDF5's CMake package configuration file doesn't function Open

Difficulty 2/5 1-3 hours Newbie friendliness 70/100

HDFGroup/hdf5#6690 · Opened Sep 24, 2026
Page buffer: `min_meta_perc` protects only pages stamped `H5FD_MEM_SUPER`, not metadata generally Open

HDFG_Internal_161

Difficulty 4/5 3-5 days Newbie friendliness 45/100

HDFGroup/hdf5#6679 · 1 assignee · Opened Sep 21, 2026
Malformed file leaves library shutdown unable to converge ("infinite loop closing library"), ~1.6MB leaked Open

Component - C Library

Difficulty 4/5 3-5 days Newbie friendliness 48/100

HDFGroup/hdf5#6677 · 2 comments · 1 assignee · Opened Sep 19, 2026
H5C__image_stats() uses FUNC_ENTER_NOAPI instead of FUNC_ENTER_PACKAGE, fails its own naming-convention assert Open

Component - C Library

Difficulty 1/5 1-3 hours Newbie friendliness 92/100

HDFGroup/hdf5#6667 · 1 assignee · Opened Sep 11, 2026
Request project stance on rust based reimplementations Open

HDFGroup/hdf5#6665 · 4 comments · 1 assignee · Opened Sep 10, 2026
HDF5 TEST VOL `RVTEST-shared-test_rest_vol` Failed Open

HDFGroup/hdf5#6664 · 1 assignee · Opened Sep 5, 2026
the cmake macro SET_HDF_OUTPUT_DIRS behaves unexpected in subprojects Open

HDFGroup/hdf5#6661 · 1 assignee · Opened Sep 4, 2026
`assert()` for maximum limit on number of filters in pipeline is off by 1 Open

HDFGroup/hdf5#6655 · 1 assignee · Opened Sep 1, 2026
H5Pget_driver_info() pushes an error when the driver has no info block, contrary to its documented contract Open

HDFGroup/hdf5#6651 · 1 assignee · Opened Aug 29, 2026
Public AI policy Open

Component - Documentation

HDFGroup/hdf5#6643 · 2 comments · 1 assignee · Opened Aug 26, 2026
H5DSattach_scale() leaks a dataset ID per existing reference, keeping the file open (pass-through VOL only) Open

Component - C Library

HDFGroup/hdf5#6639 · 1 assignee · Opened Aug 25, 2026
Documentation suggestion - add Java JDK as a prerequisite for recommended preset. Open

Component - Documentation

HDFGroup/hdf5#6638 · 1 comment · 1 assignee · Opened Aug 23, 2026
Option(s) to disable various kinds of external file access Open

Component - C Library

HDFGroup/hdf5#6618 · 4 comments · 2 reactions · 1 assignee · Opened Aug 18, 2026
Is group info message required (spec says no) or not (implementation returns error when not present)? Open

Component - Documentation

HDFGroup/hdf5#6616 · 1 comment · 1 assignee · Opened Aug 16, 2026
Onion VFD: page_size on open -- 0 is documented but rejected, and revision 0 with a mismatched value asserts Open

Component - C Library

HDFGroup/hdf5#6613 · 1 assignee · Opened Aug 15, 2026
Onion VFD: revisions silently lost when the file is small relative to page_size Open

Component - C Library

HDFGroup/hdf5#6612 · 1 assignee · Opened Aug 15, 2026
libhdf5 computes a Jenkins checksum for every metadata cache image it writes and never verifies it on read. Open

Component - C Library HDFG-internal

HDFGroup/hdf5#6611 · 1 assignee · Opened Aug 14, 2026
Format spec v4 says enum member encoding is ASCII while implementation does not care and compound member name encoding description seems to be a copy-paste error from the opaque section. Open

Component - Documentation

HDFGroup/hdf5#6610 · 1 assignee · Opened Aug 14, 2026
H5LS-tintascii fails on big-endian ppc64: h5ls prints "8-bit integer" instead of "native signed char" Open

Component - Testing Component - Tools

HDFGroup/hdf5#6609 · 1 comment · 1 assignee · Opened Aug 14, 2026
Filter failure segfaults instead of returning an error Open

Component - C Library

HDFGroup/hdf5#6601 · 1 comment · 1 assignee · Opened Aug 7, 2026
Parallel Fortran high-level build omits MPI_Fortran_MODULE_DIR and globally applies MPI_C_LINK_FLAGS Open

Component - Build

HDFGroup/hdf5#6581 · 1 comment · 1 assignee · Opened Jul 30, 2026
Proposal: modernize the installed CMake package around stable namespaced targets Open

Component - Build

HDFGroup/hdf5#6580 · 1 comment · 4 reactions · 1 assignee · Opened Jul 30, 2026
[CMake] BLOSC2 link errors with ZSTD, LZ4 Open

Component - Build

HDFGroup/hdf5#6577 · 6 comments · 1 assignee · Opened Jul 29, 2026
ROS3/S3 VFD deadlocks at process exit on Windows Open

HDFG-internal

HDFGroup/hdf5#6560 · 1 comment · 1 assignee · Opened Jul 23, 2026
Document how VOL connectors should format object tokens Open

Component - Documentation

HDFGroup/hdf5#6514 · 1 assignee · Opened Jul 8, 2026
Fix javadoc errors Open

Component - Wrappers

HDFGroup/hdf5#6505 · 1 assignee · Opened Jul 4, 2026
H5Fis_accessible(): unable to determine if file is accessible as HDF5 Open

HDFGroup/hdf5#6498 · 1 comment · 1 assignee · Opened Jul 1, 2026
feholdexcept causes HDF5 initialization to fail Open

HDFGroup/hdf5#6493 · 2 reactions · 1 assignee · Opened Jun 29, 2026
h5repack: SIGSEGV in Nbit filter processing when repacking datasets Open

HDFGroup/hdf5#6492 · 2 comments · 1 assignee · Opened Jun 28, 2026
h5ls: SIGSEGV in H5_checksum_fletcher32 due to underflowed checksum length Open

HDFGroup/hdf5#6490 · 1 comment · 1 assignee · Opened Jun 28, 2026
h5ls: SIGSEGV in Nbit filter processing when dumping datasets Open

HDFGroup/hdf5#6489 · 2 comments · 1 assignee · Opened Jun 28, 2026
h5dump: SIGSEGV in H5_checksum_fletcher32 due to underflowed checksum length Open

HDFGroup/hdf5#6488 · 1 comment · 1 assignee · Opened Jun 28, 2026
h5dump: null pointer dereference in H5T__path_find_real when dumping XML fill value Open

HDFGroup/hdf5#6487 · 1 comment · 1 assignee · Opened Jun 28, 2026
h5dump: SIGSEGV in render_bin_output when dumping dataset with native binary output Open

HDFGroup/hdf5#6486 · 1 assignee · Opened Jun 28, 2026
Provide fast bfloat16 conversion routines as user-registerable examples via H5Tregister Open

HDFGroup/hdf5#6480 · 1 assignee · Opened Jun 22, 2026
Slow h5repack performance on a large file Open

Component - Tools

HDFGroup/hdf5#6458 · 3 comments · 1 assignee · Opened Jun 15, 2026
Workflow updates needed for next release Open

Component - Testing

HDFGroup/hdf5#6452 · 2 assignees · Opened Jun 12, 2026
OSS-Fuzz: Proposal: move the OSS-Fuzz fuzzers and build scripts into this repository for upstream maintenance Open

Component - Tools

HDFGroup/hdf5#6440 · 1 assignee · Opened Jun 11, 2026
Prebuilt binary packages use wrong absolute paths Open

Component - Misc

HDFGroup/hdf5#6437 · 1 assignee · Opened Jun 6, 2026
error: member access into incomplete type 'const __normal_iterator<const char *, basic_string<char>>' Open

Component - Build

HDFGroup/hdf5#6436 · 1 assignee · Opened Jun 6, 2026
test(h5dump): reduce printf precision for t128bit_float Open

HDFGroup/hdf5#6424 · 1 assignee · Opened May 29, 2026
Add helper function to compute H5TB record size from field types and offsets Open

Component - Tools

HDFGroup/hdf5#6414 · 1 assignee · Opened May 20, 2026
test: can't link `dtypes` on arm64 windows-11 w/ debug build Open

Component - Testing

HDFGroup/hdf5#6412 · 1 assignee · Opened May 19, 2026
StackOverflow when calling `H5Gget_info` Open

HDFGroup/hdf5#6403 · 2 assignees · Opened May 12, 2026
Heap-buffer-overflow in H5O__mtime_new_decode() in H5Omtime.c Open

Component - C Library Type - Security

HDFGroup/hdf5#6401 · 3 comments · 1 assignee · Opened May 7, 2026
Memory leak in H5O__add_cont_msg when opening corrupted object via H5Rdereference Open

Component - C Library

HDFGroup/hdf5#6386 · 1 assignee · Opened Apr 28, 2026
can we set fill values for compound types with size larger than 64 MB? Open

Component - C Library

HDFGroup/hdf5#6382 · 1 assignee · Opened Apr 24, 2026
h5debug is unable to inspect file with broken root group Open

Component - Tools

HDFGroup/hdf5#6379 · 4 comments · 1 assignee · Opened Apr 22, 2026
Stale reads when a file is modified while a read-only handle is open Open

HDFGroup/hdf5#6374 · 1 assignee · Opened Apr 21, 2026
Incorrect assumption about prefix/HDF5_INSTALL_BIN_DIR//HDF5_INSTALL_LIB_DIR in compiler wrappers Open

Component - Build

HDFGroup/hdf5#6373 · 2 assignees · Opened Apr 19, 2026

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