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Fencer Vulns
medium 6.8

CVE-2026-19029 json

HDF5 scale-offset filter heap buffer over-read via crafted chunk

published 2026-10-06 33 d ago modified 2026-10-07 32 d ago also EUVD-2026-93981

cvss
6.8
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 1%
public exploits
0
none known

Summary

A heap-based buffer over-read in H5Z__filter_scaleoffset() in src/H5Zscaleoffset.c in HDF5 through 2.2.0 lets an attacker cause a denial of service (application crash) with a crafted HDF5 file. When the stored minimum bits equal the full precision of the datatype, the decoder copies d_nelmts * size bytes from the compressed chunk without checking that the chunk holds that many bytes. Both values come from attacker-controlled scale-offset filter parameters in the dataset's filter pipeline message.

Patch / fix

  • hdf5 hummingbird 1 2.2.0-0.1.2.hum1
  • java-hdf5 hummingbird 1 2.2.0-0.1.2.hum1
  • hdf5-mpich hummingbird 1 2.2.0-0.1.2.hum1
  • hdf5-openmpi hummingbird 1 2.2.0-0.1.2.hum1

red hat advisories RHSA-2026:73539

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-2026-19029 updated cvss 5.5

hdf5: HDF5: Denial of Service via crafted file in scale-offset filter

  • Red Hat Hardened Images hdf5 2.2.0-0.1.2.hum1, java-hdf5 2.2.0-0.1.2.hum1, hdf5-mpich 2.2.0-0.1.2.hum1, hdf5-openmpi 2.2.0-0.1.2.hum1
    fixed: vendor fix RHSA-2026:73539

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
none
Automatable
no
Technical impact
partial
Assessed
33 d ago

Exploit prediction

0.12% chance of exploitation in the next 30 days, higher than 1% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 6.8 CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CNA 4.0 6.8 CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/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

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.