Medium
hdf5 — security advisory
The H5Z__nbit_decompress_one_byte, H5Z__nbit_decompress_one_nooptype, and H5Z__nbit_decompress_one_atomic functions in H5Znbit.c in HDF5 prior to 2.3.0 advance a read index into the compressed chunk buffer without bounding it against the buffer's actual size. This allows attackers to cause an out-of-bounds heap read, and in constrained cases disclosure of adjacent heap memory into decompressed dataset values, via a crafted HDF5 file whose N-Bit filter parameters describe more decompressed data than the stored compressed chunk actually contains, triggered via H5Dread, e.g. by the h5ls or h5repack tools.
- Products
- hdf5
- Affected versions
- 1.10.0-patch1+docs-4, 1.10.0-patch1+docs-4ubuntu0.1~esm1, 1.10.0-patch1+docs-4ubuntu0.1~esm2, 1.10.10+repack-3.1ubuntu3, 1.10.10+repack-3.1ubuntu4, 1.10.10+repack-3ubuntu1, 1.10.4+repack-10, 1.10.4+repack-11, 1.10.4+repack-11ubuntu1, 1.10.4+repack-11ubuntu1+esm1, 1.10.6+repack-5, 1.10.7+repack-4ubuntu1, 1.10.7+repack-4ubuntu2, 1.10.8+repack1-1ubuntu1, 1.14.5+repack-3build1, 1.14.5+repack-4, 1.14.6+repack-2, 1.8.11-3ubuntu1, 1.8.11-5ubuntu1, 1.8.11-5ubuntu2, 1.8.11-5ubuntu6, 1.8.11-5ubuntu7, 1.8.11-5ubuntu7.1, 1.8.11-5ubuntu7.1+esm1, 1.8.11-5ubuntu7.1+esm2, 1.8.15-patch1+docs-4, 1.8.15-patch1+docs-5, 1.8.16+docs-1, 1.8.16+docs-2, 1.8.16+docs-3, 1.8.16+docs-3ubuntu1, 1.8.16+docs-4, 1.8.16+docs-4ubuntu1, 1.8.16+docs-4ubuntu1.1, 1.8.16+docs-4ubuntu1.1+esm1, 1.8.16+docs-4ubuntu1.1+esm2, 2.2.0+repack-4, 2.2.0+repack-5
- Fixed versions
- Not specified
- CVEs
- CVE-2026-19027
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:57 UTC · Revision 1
Source evidence
The H5Z__nbit_decompress_one_byte, H5Z__nbit_decompress_one_nooptype, and H5Z__nbit_decompress_one_atomic functions in H5Znbit.c in HDF5 prior to 2.3.0 advance a read index into the compressed chunk buffer without bounding it against the buffer's actual size. This allows attackers to cause an out-of-bounds heap read, and in constrained cases disclosure of adjacent heap memory into decompressed dataset values, via a crafted HDF5 file whose N-Bit filter parameters describe more decompressed data than the stored compressed chunk actually contains, triggered via H5Dread, e.g. by the h5ls or h5repack tools.
osv:UBUNTU-CVE-2026-19027
hdf5
Fixed versions: Not specified
hdf5
Fixed versions: Not specified
hdf5
Fixed versions: Not specified
hdf5
Fixed versions: Not specified
hdf5
Fixed versions: Not specified
hdf5
Fixed versions: Not specified
hdf5
Fixed versions: Not specified
hdf5
Fixed versions: Not specified
Complete source record
{
"id": "3d427283e90181c8c1b19850141631f425f09c3bd86966d8ba5d12eec9c8afd4",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-19027",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-19027",
"summary": "The H5Z__nbit_decompress_one_byte, H5Z__nbit_decompress_one_nooptype, and H5Z__nbit_decompress_one_atomic functions in H5Znbit.c in HDF5 prior to 2.3.0 advance a read index into the compressed chunk buffer without bounding it against the buffer's actual size. This allows attackers to cause an out-of-bounds heap read, and in constrained cases disclosure of adjacent heap memory into decompressed dataset values, via a crafted HDF5 file whose N-Bit filter parameters describe more decompressed data than the stored compressed chunk actually contains, triggered via H5Dread, e.g. by the h5ls or h5repack tools.",
"evidence": "osv:UBUNTU-CVE-2026-19027",
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{
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"evidence": "/affected/3/versions"
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{
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"evidence": "/affected/4/versions"
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{
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"evidence": "/affected/4/versions"
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{
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"evidence": "/affected/5/versions"
},
{
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"evidence": "/affected/5/versions"
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"severity": "medium",
"structured": {
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"aliases": [
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"metrics": [
{
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},
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],
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"modified": "2026-10-17T12:59:54.964518806Z",
"provider": "osv",
"upstream": [
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],
"references": [
"https://ubuntu.com/security/CVE-2026-19027",
"https://www.cve.org/CVERecord?id=CVE-2026-19027",
"https://github.com/HDFGroup/hdf5/pull/6497",
"https://github.com/HDFGroup/hdf5/issues/6489",
"https://github.com/HDFGroup/hdf5/issues/6492"
]
},
"related_cves": [
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"evidence": "/upstream"
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],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 359951,
"published_at": "2026-08-06T00:16:00+00:00"
}