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Fencer Vulns
medium 5.5

CVE-2026-17573 json

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

published 2026-07-27 3 mo ago modified 2026-10-24 15 d ago also EUVD-2026-49319 , JLSEC-2026-1385

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 4%
public exploits
0
none known

Summary

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.

Patch / fix

  • julia HDF5_jll 2.2.0+0
  • hdfgroup hdf5 2.2.0
  • hdf5 Debian 14 2.1.0+repack-1

debian advisories DEBIAN-CVE-2026-17573

  • hdf5 hummingbird 1 2.2.0-0.1.1.hum1
  • java-hdf5 hummingbird 1 2.2.0-0.1.1.hum1
  • hdf5-mpich hummingbird 1 2.2.0-0.1.1.hum1
  • hdf5-openmpi hummingbird 1 2.2.0-0.1.1.hum1

red hat advisories RHSA-2026:61630

  • hdf5 Azure Linux 3.0 1.14.6-4

azure linux advisories AZL-94013

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-17573 updated cvss 5.0

hdf5: HDF5 library: Denial of Service via crafted HDF5 file processing

  • Red Hat AI Inference Server rhaii/vllm-cpu-rhel9, rhaii/vllm-tpu-rhel9, rhaii/vllm-cuda-rhel9, rhaii/vllm-rocm-rhel9, rhaiis/vllm-cpu-rhel9, rhaiis/vllm-tpu-rhel9, +9 more Red Hat Enterprise Linux AI (RHEL AI) 3 hdf5 1.14.6-6.el9ai Red Hat OpenShift AI (RHOAI) rhoai/odh-automl-rhel9, rhoai/odh-autorag-rhel9, rhoai/odh-mlserver-rhel9, rhai/base-image-cpu-rhel9, rhai/base-image-tpu-rhel9, rhai/base-image-gaudi-rhel9, +24 more
    affected: no fix available “Fix deferred”
  • Red Hat Hardened Images hdf5 2.2.0-0.1.1.hum1
    fixed: vendor fix RHSA-2026:61630

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
3 mo ago

Exploit prediction

0.15% chance of exploitation in the next 30 days, higher than 4% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/HDFGroup/hdf5/issues/6124 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 4.0 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
CNA 4.0 4.0 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 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
OSV 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
julia HDF5_jll
<2.2.0+0
2.2.0+0

Affected products

  • The HDF Group HDF5

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.