CVE catalog

CVE-2026-26197

HDF5 is a high-performance library and a file format…

HDF5 is a high-performance library and a file format specification that implements the HDF5 data model. If a file is corrupted such that an array datatype's size, the number of elements, and the element size are not in agreement it can trigger an out of bounds read. The array datatype stores the full size of the datatype (`dt->shared->size`) separately from the number of elements (`dt->shared->u.array.nelem`) and the element size (`dt->shared->parent->shared->size`). If any one of these are corrupted so that they don't align with the others (element size * nelem = full size), it can lead to an out of bounds read. Depending on what is corrupted, it can alter the type of out of bounds read triggered. The vulnerability is present only in files that have been maliciously altered, as its generally not possible to independently alter the full size of the datatype, the element count and the element size. As such, this is only present if a malicious actor is altering files, and won't appear in regular usage.

Severity: Medium · CVSS 5.9CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published: Jul 20, 2026, 2:55:50 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.37% · Oct 27, 2026

Projects and upstream resources

[hdf5][Source-reported homepage]

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Version impact has not been established. The original provider fields are retained below.

Provider details and historical evidence

Original provider fields

{
  "package_releases": [
    {
      "name": "hdf5",
      "status": "fixed",
      "release": "sid",
      "version": "2.2.0+repack-5"
    },
    {
      "name": "hdf5",
      "status": "fixed",
      "release": "forky",
      "version": "2.2.0+repack-5"
    },
    {
      "name": "hdf5",
      "status": "vulnerable",
      "release": "trixie",
      "version": "1.14.5+repack-3"
    },
    {
      "name": "hdf5",
      "status": "vulnerable",
      "release": "bookworm",
      "version": "1.10.8+repack1-1"
    }
  ],
  "fixed_versions": [
    {
      "bug": 1143002,
      "name": "hdf5",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "unimportant",
      "fixed_version": "2.1.0+repack-1"
    },
    {
      "bug": 1143002,
      "name": "hdf5",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "unimportant",
      "fixed_version": "2.1.0+repack-1"
    },
    {
      "bug": 1143002,
      "name": "hdf5",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "unimportant",
      "fixed_version": ""
    },
    {
      "bug": 1143002,
      "name": "hdf5",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "unimportant",
      "fixed_version": ""
    }
  ],
  "distribution_packages": [
    {
      "name": "hdf5",
      "ecosystem": "cpe",
      "fixed_version": "not yet fixed"
    },
    {
      "name": "hdf5",
      "ranges": [
        {
          "fixed": "2.1.0",
          "introduced": "",
          "last_affected": "",
          "start_excluding": ""
        }
      ],
      "ecosystem": "cpe",
      "fixed_version": "2.1.0",
      "provider_record_id": "NVD-CVE-2026-26197"
    }
  ]
}

[Debian bug #1143002]

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[hdf5-helpers]Unknown
Source package: [hdf5]
Details (2)
- 1.10.8+repack1-1 · amd64 · bookworm
  Affected
  nvd · hdf5 · debian · bookworm; nvd · hdf5 · debian · 12
- 1.10.8+repack1-1 · arm64 · bookworm
  Affected
  nvd · hdf5 · debian · bookworm; nvd · hdf5 · debian · 12
[hdf5-tools]Unknown
Source package: [hdf5]
Details (2)
- 1.10.8+repack1-1 · amd64 · bookworm
  Affected
  nvd · hdf5 · debian · bookworm; nvd · hdf5 · debian · 12
- 1.10.8+repack1-1 · arm64 · bookworm
  Affected
  nvd · hdf5 · debian · bookworm; nvd · hdf5 · debian · 12
[libhdf5-103]Unknown
Source package: [hdf5]
Details (2)
- 1.10.8+repack1-1 · amd64 · bookworm
  Affected
  nvd · hdf5 · debian · bookworm; nvd · hdf5 · debian · 12
- 1.10.8+repack1-1 · arm64 · bookworm
  Affected
  nvd · hdf5 · debian · bookworm; nvd · hdf5 · debian · 12
[libhdf5-103-1]Unknown
Source package: [hdf5]
Details (2)
- 1.10.8+repack1-1 · amd64 · bookworm
  Affected
  nvd · hdf5 · debian · bookworm; nvd · hdf5 · debian · 12
- 1.10.8+repack1-1 · arm64 · bookworm
  Affected
  nvd · hdf5 · debian · bookworm; nvd · hdf5 · debian · 12
[libhdf5-cpp-103]Unknown
Source package: [hdf5]
Details (2)
- 1.10.8+repack1-1 · amd64 · bookworm
  Affected
  nvd · hdf5 · debian · bookworm; nvd · hdf5 · debian · 12
- 1.10.8+repack1-1 · arm64 · bookworm
  Affected
  nvd · hdf5 · debian · bookworm; nvd · hdf5 · debian · 12
[libhdf5-cpp-103-1]Unknown
Source package: [hdf5]
Details (2)
- 1.10.8+repack1-1 · amd64 · bookworm
  Affected
  nvd · hdf5 · debian · bookworm; nvd · hdf5 · debian · 12
- 1.10.8+repack1-1 · arm64 · bookworm
  Affected
  nvd · hdf5 · debian · bookworm; nvd · hdf5 · debian · 12
[libhdf5-dev]Unknown
Source package: [hdf5]
Details (2)
- 1.10.8+repack1-1 · amd64 · bookworm
  Affected
  nvd · hdf5 · debian · bookworm; nvd · hdf5 · debian · 12
- 1.10.8+repack1-1 · arm64 · bookworm
  Affected
  nvd · hdf5 · debian · bookworm; nvd · hdf5 · debian · 12
[libhdf5-doc]Unknown
Source package: [hdf5]
Details (2)
- 1.10.8+repack1-1 · all · bookworm
  Affected
  nvd · hdf5 · debian · bookworm; nvd · hdf5 · debian · 12
- 1.10.8+repack1-1 · all · bookworm
  Affected
  nvd · hdf5 · debian · bookworm; nvd · hdf5 · debian · 12
[libhdf5-fortran-102]Unknown
Source package: [hdf5]
Details (2)
- 1.10.8+repack1-1 · amd64 · bookworm
  Affected
  nvd · hdf5 · debian · bookworm; nvd · hdf5 · debian · 12
- 1.10.8+repack1-1 · arm64 · bookworm
  Affected
  nvd · hdf5 · debian · bookworm; nvd · hdf5 · debian · 12
[libhdf5-hl-100]Unknown
Source package: [hdf5]
Details (2)
- 1.10.8+repack1-1 · amd64 · bookworm
  Affected
  nvd · hdf5 · debian · bookworm; nvd · hdf5 · debian · 12
- 1.10.8+repack1-1 · arm64 · bookworm
  Affected
  nvd · hdf5 · debian · bookworm; nvd · hdf5 · debian · 12
[libhdf5-hl-cpp-100]Unknown
Source package: [hdf5]
Details (2)
- 1.10.8+repack1-1 · amd64 · bookworm
  Affected
  nvd · hdf5 · debian · bookworm; nvd · hdf5 · debian · 12
- 1.10.8+repack1-1 · arm64 · bookworm
  Affected
  nvd · hdf5 · debian · bookworm; nvd · hdf5 · debian · 12
[libhdf5-hl-fortran-100]Unknown
Source package: [hdf5]
Details (2)
- 1.10.8+repack1-1 · amd64 · bookworm
  Affected
  nvd · hdf5 · debian · bookworm; nvd · hdf5 · debian · 12
- 1.10.8+repack1-1 · arm64 · bookworm
  Affected
  nvd · hdf5 · debian · bookworm; nvd · hdf5 · debian · 12
[libhdf5-java]Unknown
Source package: [hdf5]
Details (2)
- 1.10.8+repack1-1 · all · bookworm
  Affected
  nvd · hdf5 · debian · bookworm; nvd · hdf5 · debian · 12
- 1.10.8+repack1-1 · all · bookworm
  Affected
  nvd · hdf5 · debian · bookworm; nvd · hdf5 · debian · 12
[libhdf5-jni]Unknown
Source package: [hdf5]
Details (2)
- 1.10.8+repack1-1 · amd64 · bookworm
  Affected
  nvd · hdf5 · debian · bookworm; nvd · hdf5 · debian · 12
- 1.10.8+repack1-1 · arm64 · bookworm
  Affected
  nvd · hdf5 · debian · bookworm; nvd · hdf5 · debian · 12
[libhdf5-mpich-103]Unknown
Source package: [hdf5]
Details (2)
- 1.10.8+repack1-1 · amd64 · bookworm
  Affected
  nvd · hdf5 · debian · bookworm; nvd · hdf5 · debian · 12
- 1.10.8+repack1-1 · arm64 · bookworm
  Affected
  nvd · hdf5 · debian · bookworm; nvd · hdf5 · debian · 12
[libhdf5-mpich-103-1]Unknown
Source package: [hdf5]
Details (2)
- 1.10.8+repack1-1 · amd64 · bookworm
  Affected
  nvd · hdf5 · debian · bookworm; nvd · hdf5 · debian · 12
- 1.10.8+repack1-1 · arm64 · bookworm
  Affected
  nvd · hdf5 · debian · bookworm; nvd · hdf5 · debian · 12
[libhdf5-mpich-cpp-103-1]Unknown
Source package: [hdf5]
Details (2)
- 1.10.8+repack1-1 · amd64 · bookworm
  Affected
  nvd · hdf5 · debian · bookworm; nvd · hdf5 · debian · 12
- 1.10.8+repack1-1 · arm64 · bookworm
  Affected
  nvd · hdf5 · debian · bookworm; nvd · hdf5 · debian · 12
[libhdf5-mpich-dev]Unknown
Source package: [hdf5]
Details (2)
- 1.10.8+repack1-1 · amd64 · bookworm
  Affected
  nvd · hdf5 · debian · bookworm; nvd · hdf5 · debian · 12
- 1.10.8+repack1-1 · arm64 · bookworm
  Affected
  nvd · hdf5 · debian · bookworm; nvd · hdf5 · debian · 12
[libhdf5-mpich-fortran-102]Unknown
Source package: [hdf5]
Details (2)
- 1.10.8+repack1-1 · amd64 · bookworm
  Affected
  nvd · hdf5 · debian · bookworm; nvd · hdf5 · debian · 12
- 1.10.8+repack1-1 · arm64 · bookworm
  Affected
  nvd · hdf5 · debian · bookworm; nvd · hdf5 · debian · 12
[libhdf5-mpich-hl-100]Unknown
Source package: [hdf5]
Details (2)
- 1.10.8+repack1-1 · amd64 · bookworm
  Affected
  nvd · hdf5 · debian · bookworm; nvd · hdf5 · debian · 12
- 1.10.8+repack1-1 · arm64 · bookworm
  Affected
  nvd · hdf5 · debian · bookworm; nvd · hdf5 · debian · 12

Next results

Observed: Oct 24, 2026, 8:41:05 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]