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CVE-2026-17573· NVD / CVE Program· CNA HDFG

Double Free in H5D__chunk_copy() in HDF5 via a Crafted Chunk-Index Size Field

A double free vulnerability was discovered in the HDF5 library. Processing a crafted HDF5 file containing an oversized chunk size field via h5repack may cause the application to abort due to a double free.

MediumCVSS 4.0 · v4.0—No exploit Fix available

Noroxi analysis

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Published
Jul 27, 2026
Updated
Aug 18, 2026
EPSS
0.2% · 4th percentile
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Report tools

JSON

Action score

16

Monitor

Low priority for now.

CVSS
16 / 40 · 4.0 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
proof of concept
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · HDFG
4.0
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

VendorProduct
hdfgrouphdf5

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • hdfgroup hdf5before 2.2.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (HDFG). Independent of NVD's CPE analysis and usually ahead of it.

  • The HDF Group HDF5

    • <= 2.1.1affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12hdf5all versions—
Debian:14hdf5before 2.1.0+repack-12.1.0+repack-1
Red Hat:hummingbird:1hdf5before 0:2.2.0-0.1.1.hum10:2.2.0-0.1.1.hum1
Red Hat:hummingbird:1hdf5-develbefore 0:2.2.0-0.1.1.hum10:2.2.0-0.1.1.hum1
Red Hat:hummingbird:1hdf5-mpichbefore 0:2.2.0-0.1.1.hum10:2.2.0-0.1.1.hum1
Red Hat:hummingbird:1hdf5-mpich-develbefore 0:2.2.0-0.1.1.hum10:2.2.0-0.1.1.hum1
Red Hat:hummingbird:1hdf5-mpich-staticbefore 0:2.2.0-0.1.1.hum10:2.2.0-0.1.1.hum1
Red Hat:hummingbird:1hdf5-openmpibefore 0:2.2.0-0.1.1.hum10:2.2.0-0.1.1.hum1
Red Hat:hummingbird:1hdf5-openmpi-develbefore 0:2.2.0-0.1.1.hum10:2.2.0-0.1.1.hum1
Red Hat:hummingbird:1hdf5-openmpi-staticbefore 0:2.2.0-0.1.1.hum10:2.2.0-0.1.1.hum1
Red Hat:hummingbird:1hdf5-staticbefore 0:2.2.0-0.1.1.hum10:2.2.0-0.1.1.hum1
Red Hat:hummingbird:1java-hdf5before 0:2.2.0-0.1.1.hum10:2.2.0-0.1.1.hum1

Same product

hdfgroup: all records

Other highest-scoring records for the same primary product.

  • CVE-2018-13876An issue was discovered in the HDF HDF5 1.8.20 library.
    40Plan
  • CVE-2018-13874An issue was discovered in the HDF HDF5 1.8.20 library.
    40Plan
  • CVE-2018-13873An issue was discovered in the HDF HDF5 1.8.20 library.
    40Plan
  • CVE-2018-13872An issue was discovered in the HDF HDF5 1.8.20 library.
    40Plan
  • CVE-2018-13871An issue was discovered in the HDF HDF5 1.8.20 library.
    40Plan
  • CVE-2018-13870An issue was discovered in the HDF HDF5 1.8.20 library.
    40Plan

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:hdf52.1.0+repack-1 · Debian:14Package registry (OSV)
red hat:hdf50:2.2.0-0.1.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:hdf5-devel0:2.2.0-0.1.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:hdf5-mpich0:2.2.0-0.1.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:hdf5-mpich-devel0:2.2.0-0.1.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:hdf5-mpich-static0:2.2.0-0.1.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:hdf5-openmpi0:2.2.0-0.1.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:hdf5-openmpi-devel0:2.2.0-0.1.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:hdf5-openmpi-static0:2.2.0-0.1.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:hdf5-static0:2.2.0-0.1.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:java-hdf50:2.2.0-0.1.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • No account or password is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Local
Attack complexity
Low
Privileges required
None
User interaction
A
Scope
X

Weakness class (CWE)

CWE-415 · Double Free

CVSS vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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