UBUNTU-CVE-2026-19027

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Source
https://ubuntu.com/security/CVE-2026-19027
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-19027.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-19027
Upstream
  • CVE-2026-19027
Published
2026-08-06T00:00:00Z
Modified
2026-08-06T22:15:13.098244132Z
Severity
  • 6.9 (Medium) CVSS_V4 - CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

The H5Znbitdecompressone_byte, H5Znbitdecompressonenooptype, and H5Znbitdecompressoneatomic functions in H5Znbit.c in HDF5 through 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.

References

Affected packages

Ubuntu:22.04:LTS
hdf5

Package

Name
hdf5
Purl
pkg:deb/ubuntu/hdf5?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.10.6+repack-5
1.10.7+repack-4ubuntu1
1.10.7+repack-4ubuntu2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.10.7+repack-4ubuntu2",
            "binary_name": "hdf5-helpers"
        },
        {
            "binary_version": "1.10.7+repack-4ubuntu2",
            "binary_name": "hdf5-tools"
        },
        {
            "binary_version": "1.10.7+repack-4ubuntu2",
            "binary_name": "libhdf5-103"
        },
        {
            "binary_version": "1.10.7+repack-4ubuntu2",
            "binary_name": "libhdf5-103-1"
        },
        {
            "binary_version": "1.10.7+repack-4ubuntu2",
            "binary_name": "libhdf5-cpp-103"
        },
        {
            "binary_version": "1.10.7+repack-4ubuntu2",
            "binary_name": "libhdf5-cpp-103-1"
        },
        {
            "binary_version": "1.10.7+repack-4ubuntu2",
            "binary_name": "libhdf5-fortran-102"
        },
        {
            "binary_version": "1.10.7+repack-4ubuntu2",
            "binary_name": "libhdf5-hl-100"
        },
        {
            "binary_version": "1.10.7+repack-4ubuntu2",
            "binary_name": "libhdf5-hl-cpp-100"
        },
        {
            "binary_version": "1.10.7+repack-4ubuntu2",
            "binary_name": "libhdf5-hl-fortran-100"
        },
        {
            "binary_version": "1.10.7+repack-4ubuntu2",
            "binary_name": "libhdf5-java"
        },
        {
            "binary_version": "1.10.7+repack-4ubuntu2",
            "binary_name": "libhdf5-jni"
        },
        {
            "binary_version": "1.10.7+repack-4ubuntu2",
            "binary_name": "libhdf5-mpich-103"
        },
        {
            "binary_version": "1.10.7+repack-4ubuntu2",
            "binary_name": "libhdf5-mpich-103-1"
        },
        {
            "binary_version": "1.10.7+repack-4ubuntu2",
            "binary_name": "libhdf5-mpich-cpp-103-1"
        },
        {
            "binary_version": "1.10.7+repack-4ubuntu2",
            "binary_name": "libhdf5-mpich-fortran-102"
        },
        {
            "binary_version": "1.10.7+repack-4ubuntu2",
            "binary_name": "libhdf5-mpich-hl-100"
        },
        {
            "binary_version": "1.10.7+repack-4ubuntu2",
            "binary_name": "libhdf5-mpich-hl-cpp-100"
        },
        {
            "binary_version": "1.10.7+repack-4ubuntu2",
            "binary_name": "libhdf5-mpich-hl-fortran-100"
        },
        {
            "binary_version": "1.10.7+repack-4ubuntu2",
            "binary_name": "libhdf5-openmpi-103"
        },
        {
            "binary_version": "1.10.7+repack-4ubuntu2",
            "binary_name": "libhdf5-openmpi-103-1"
        },
        {
            "binary_version": "1.10.7+repack-4ubuntu2",
            "binary_name": "libhdf5-openmpi-cpp-103-1"
        },
        {
            "binary_version": "1.10.7+repack-4ubuntu2",
            "binary_name": "libhdf5-openmpi-fortran-102"
        },
        {
            "binary_version": "1.10.7+repack-4ubuntu2",
            "binary_name": "libhdf5-openmpi-hl-100"
        },
        {
            "binary_version": "1.10.7+repack-4ubuntu2",
            "binary_name": "libhdf5-openmpi-hl-cpp-100"
        },
        {
            "binary_version": "1.10.7+repack-4ubuntu2",
            "binary_name": "libhdf5-openmpi-hl-fortran-100"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-19027.json"
Ubuntu:24.04:LTS
hdf5

Package

Name
hdf5
Purl
pkg:deb/ubuntu/hdf5?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.10.8+repack1-1ubuntu1
1.10.10+repack-3ubuntu1
1.10.10+repack-3.1ubuntu3
1.10.10+repack-3.1ubuntu4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.10.10+repack-3.1ubuntu4",
            "binary_name": "hdf5-helpers"
        },
        {
            "binary_version": "1.10.10+repack-3.1ubuntu4",
            "binary_name": "hdf5-tools"
        },
        {
            "binary_version": "1.10.10+repack-3.1ubuntu4",
            "binary_name": "libhdf5-103-1t64"
        },
        {
            "binary_version": "1.10.10+repack-3.1ubuntu4",
            "binary_name": "libhdf5-cpp-103-1t64"
        },
        {
            "binary_version": "1.10.10+repack-3.1ubuntu4",
            "binary_name": "libhdf5-fortran-102t64"
        },
        {
            "binary_version": "1.10.10+repack-3.1ubuntu4",
            "binary_name": "libhdf5-hl-100t64"
        },
        {
            "binary_version": "1.10.10+repack-3.1ubuntu4",
            "binary_name": "libhdf5-hl-cpp-100t64"
        },
        {
            "binary_version": "1.10.10+repack-3.1ubuntu4",
            "binary_name": "libhdf5-hl-fortran-100t64"
        },
        {
            "binary_version": "1.10.10+repack-3.1ubuntu4",
            "binary_name": "libhdf5-java"
        },
        {
            "binary_version": "1.10.10+repack-3.1ubuntu4",
            "binary_name": "libhdf5-jni"
        },
        {
            "binary_version": "1.10.10+repack-3.1ubuntu4",
            "binary_name": "libhdf5-mpich-103-1t64"
        },
        {
            "binary_version": "1.10.10+repack-3.1ubuntu4",
            "binary_name": "libhdf5-mpich-cpp-103-1t64"
        },
        {
            "binary_version": "1.10.10+repack-3.1ubuntu4",
            "binary_name": "libhdf5-mpich-fortran-102t64"
        },
        {
            "binary_version": "1.10.10+repack-3.1ubuntu4",
            "binary_name": "libhdf5-mpich-hl-100t64"
        },
        {
            "binary_version": "1.10.10+repack-3.1ubuntu4",
            "binary_name": "libhdf5-mpich-hl-cpp-100t64"
        },
        {
            "binary_version": "1.10.10+repack-3.1ubuntu4",
            "binary_name": "libhdf5-mpich-hl-fortran-100t64"
        },
        {
            "binary_version": "1.10.10+repack-3.1ubuntu4",
            "binary_name": "libhdf5-openmpi-103-1t64"
        },
        {
            "binary_version": "1.10.10+repack-3.1ubuntu4",
            "binary_name": "libhdf5-openmpi-cpp-103-1t64"
        },
        {
            "binary_version": "1.10.10+repack-3.1ubuntu4",
            "binary_name": "libhdf5-openmpi-fortran-102t64"
        },
        {
            "binary_version": "1.10.10+repack-3.1ubuntu4",
            "binary_name": "libhdf5-openmpi-hl-100t64"
        },
        {
            "binary_version": "1.10.10+repack-3.1ubuntu4",
            "binary_name": "libhdf5-openmpi-hl-cpp-100t64"
        },
        {
            "binary_version": "1.10.10+repack-3.1ubuntu4",
            "binary_name": "libhdf5-openmpi-hl-fortran-100t64"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-19027.json"
Ubuntu:26.04:LTS
hdf5

Package

Name
hdf5
Purl
pkg:deb/ubuntu/hdf5?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.14.5+repack-3build1
1.14.5+repack-4
1.14.6+repack-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.14.6+repack-2",
            "binary_name": "hdf5-helpers"
        },
        {
            "binary_version": "1.14.6+repack-2",
            "binary_name": "hdf5-tools"
        },
        {
            "binary_version": "1.14.6+repack-2",
            "binary_name": "libhdf5-310"
        },
        {
            "binary_version": "1.14.6+repack-2",
            "binary_name": "libhdf5-cpp-310"
        },
        {
            "binary_version": "1.14.6+repack-2",
            "binary_name": "libhdf5-fortran-310"
        },
        {
            "binary_version": "1.14.6+repack-2",
            "binary_name": "libhdf5-hl-310"
        },
        {
            "binary_version": "1.14.6+repack-2",
            "binary_name": "libhdf5-hl-cpp-310"
        },
        {
            "binary_version": "1.14.6+repack-2",
            "binary_name": "libhdf5-hl-fortran-310"
        },
        {
            "binary_version": "1.14.6+repack-2",
            "binary_name": "libhdf5-java"
        },
        {
            "binary_version": "1.14.6+repack-2",
            "binary_name": "libhdf5-jni"
        },
        {
            "binary_version": "1.14.6+repack-2",
            "binary_name": "libhdf5-mpich-310"
        },
        {
            "binary_version": "1.14.6+repack-2",
            "binary_name": "libhdf5-mpich-cpp-310"
        },
        {
            "binary_version": "1.14.6+repack-2",
            "binary_name": "libhdf5-mpich-fortran-310"
        },
        {
            "binary_version": "1.14.6+repack-2",
            "binary_name": "libhdf5-mpich-hl-310"
        },
        {
            "binary_version": "1.14.6+repack-2",
            "binary_name": "libhdf5-mpich-hl-cpp-310"
        },
        {
            "binary_version": "1.14.6+repack-2",
            "binary_name": "libhdf5-mpich-hl-fortran-310"
        },
        {
            "binary_version": "1.14.6+repack-2",
            "binary_name": "libhdf5-openmpi-310"
        },
        {
            "binary_version": "1.14.6+repack-2",
            "binary_name": "libhdf5-openmpi-cpp-310"
        },
        {
            "binary_version": "1.14.6+repack-2",
            "binary_name": "libhdf5-openmpi-fortran-310"
        },
        {
            "binary_version": "1.14.6+repack-2",
            "binary_name": "libhdf5-openmpi-hl-310"
        },
        {
            "binary_version": "1.14.6+repack-2",
            "binary_name": "libhdf5-openmpi-hl-cpp-310"
        },
        {
            "binary_version": "1.14.6+repack-2",
            "binary_name": "libhdf5-openmpi-hl-fortran-310"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-19027.json"
Ubuntu:Pro:14.04:LTS
hdf5

Package

Name
hdf5
Purl
pkg:deb/ubuntu/hdf5?arch=source&distro=esm-infra-legacy%2Ftrusty

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*
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

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.8.11-5ubuntu7.1+esm2",
            "binary_name": "hdf5-helpers"
        },
        {
            "binary_version": "1.8.11-5ubuntu7.1+esm2",
            "binary_name": "hdf5-tools"
        },
        {
            "binary_version": "1.8.11-5ubuntu7.1+esm2",
            "binary_name": "libhdf5-7"
        },
        {
            "binary_version": "1.8.11-5ubuntu7.1+esm2",
            "binary_name": "libhdf5-mpich2-7"
        },
        {
            "binary_version": "1.8.11-5ubuntu7.1+esm2",
            "binary_name": "libhdf5-openmpi-7"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-19027.json"
Ubuntu:Pro:16.04:LTS
hdf5

Package

Name
hdf5
Purl
pkg:deb/ubuntu/hdf5?arch=source&distro=esm-apps%2Fxenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*
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

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.8.16+docs-4ubuntu1.1+esm2",
            "binary_name": "hdf5-helpers"
        },
        {
            "binary_version": "1.8.16+docs-4ubuntu1.1+esm2",
            "binary_name": "hdf5-tools"
        },
        {
            "binary_version": "1.8.16+docs-4ubuntu1.1+esm2",
            "binary_name": "libhdf5-10"
        },
        {
            "binary_version": "1.8.16+docs-4ubuntu1.1+esm2",
            "binary_name": "libhdf5-cpp-11"
        },
        {
            "binary_version": "1.8.16+docs-4ubuntu1.1+esm2",
            "binary_name": "libhdf5-mpich-10"
        },
        {
            "binary_version": "1.8.16+docs-4ubuntu1.1+esm2",
            "binary_name": "libhdf5-openmpi-10"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-19027.json"
Ubuntu:Pro:18.04:LTS
hdf5

Package

Name
hdf5
Purl
pkg:deb/ubuntu/hdf5?arch=source&distro=esm-apps%2Fbionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.10.0-patch1+docs-4
1.10.0-patch1+docs-4ubuntu0.1~esm1
1.10.0-patch1+docs-4ubuntu0.1~esm2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.10.0-patch1+docs-4ubuntu0.1~esm2",
            "binary_name": "hdf5-helpers"
        },
        {
            "binary_version": "1.10.0-patch1+docs-4ubuntu0.1~esm2",
            "binary_name": "hdf5-tools"
        },
        {
            "binary_version": "1.10.0-patch1+docs-4ubuntu0.1~esm2",
            "binary_name": "libhdf5-100"
        },
        {
            "binary_version": "1.10.0-patch1+docs-4ubuntu0.1~esm2",
            "binary_name": "libhdf5-cpp-100"
        },
        {
            "binary_version": "1.10.0-patch1+docs-4ubuntu0.1~esm2",
            "binary_name": "libhdf5-java"
        },
        {
            "binary_version": "1.10.0-patch1+docs-4ubuntu0.1~esm2",
            "binary_name": "libhdf5-jni"
        },
        {
            "binary_version": "1.10.0-patch1+docs-4ubuntu0.1~esm2",
            "binary_name": "libhdf5-mpich-100"
        },
        {
            "binary_version": "1.10.0-patch1+docs-4ubuntu0.1~esm2",
            "binary_name": "libhdf5-openmpi-100"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-19027.json"
Ubuntu:Pro:20.04:LTS
hdf5

Package

Name
hdf5
Purl
pkg:deb/ubuntu/hdf5?arch=source&distro=esm-apps%2Ffocal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.10.4+repack-10
1.10.4+repack-11
1.10.4+repack-11ubuntu1
1.10.4+repack-11ubuntu1+esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.10.4+repack-11ubuntu1+esm1",
            "binary_name": "hdf5-helpers"
        },
        {
            "binary_version": "1.10.4+repack-11ubuntu1+esm1",
            "binary_name": "hdf5-tools"
        },
        {
            "binary_version": "1.10.4+repack-11ubuntu1+esm1",
            "binary_name": "libhdf5-103"
        },
        {
            "binary_version": "1.10.4+repack-11ubuntu1+esm1",
            "binary_name": "libhdf5-cpp-103"
        },
        {
            "binary_version": "1.10.4+repack-11ubuntu1+esm1",
            "binary_name": "libhdf5-java"
        },
        {
            "binary_version": "1.10.4+repack-11ubuntu1+esm1",
            "binary_name": "libhdf5-jni"
        },
        {
            "binary_version": "1.10.4+repack-11ubuntu1+esm1",
            "binary_name": "libhdf5-mpich-103"
        },
        {
            "binary_version": "1.10.4+repack-11ubuntu1+esm1",
            "binary_name": "libhdf5-openmpi-103"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-19027.json"