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TI-2026-15548 Aliases CVE-2026-19024GHSA-c7cf-qx8c-5ph7

HDF5 H5Pget_fill_value NULL Pointer Dereference via Malformed Fill Value Message

Priority HIGH 69CWE-476Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
None
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 1 fixed, 1 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-476.

Summary

NULL pointer dereference in H5Pget_fill_value in HDF5 before 2.3.0 allows attackers to cause a denial of service via a dataset whose version 1 or 2 fill value message has the "defined" flag set together with a negative size field, which is not normalized to the library's "undefined" sentinel and reaches H5T_path_find with a NULL datatype.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00185 8th percentileScored 2026-11-07
Fix Partial Red Hat: 1 advisoryRed Hat: 1 fixed, 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
The HDF GroupHDF5up to 2.3.0—No fix listedCNA
  • HDF5 VendorThe HDF Group Affected up to 2.3.0 Fixed in — No fix listed CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:hdfgroup:hdf5:*:*:*:*:*:*:*:*——The HDF Group
  • cpe:2.3:a:hdfgroup:hdf5:*:*:*:*:*:*:*:* Versions — — ·The HDF Group

Remediation

Red Hat 1 advisory

  • RHSA-2026:79131 Released 2026-10-08 · Red Hat rating Moderate
    Red Hat Hardened Images RPMs Security Update
    • Red Hat Hardened Images hdf5-2.2.0-0.1.3.hum1@aarch64, hdf5-2.2.0-0.1.3.hum1@src, hdf5-2.2.0-0.1.3.hum1@x86_64 +18

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux AI (RHEL AI) 3AffectedNo fix yet
Red Hat Hardened ImagesFixed RHSA-2026:79131

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-19024
  2. 2026-10-03 Alias added: GHSA-c7cf-qx8c-5ph7
  3. 2026-10-09 Fix available: RHSA-2026:79131 · Red Hat
  4. 2026-10-09 Fix available: Red Hat Hardened Images · Red Hat

References

Other 1

  • TI-2025-28698 hdf5 v1.14.6 was discovered to contain a heap buffer overflow via the H5Z__filter_scaleoffset function. CVSS 3.1HIGH 8.8
  • TI-2025-28697 hdf5 v1.14.6 was discovered to contain a heap buffer overflow via the H5VM_memcpyvv function. CVSS 3.1HIGH 8.8
  • TI-2020-13412 Buffer Overflow vulnerability in function H5S_close in H5S.c in HDF5 1.10.4 allows remote… CVSS 3.1HIGH 8.8
  • TI-2021-15413 Buffer Overflow vulnerability in HDFGroup hdf5-h5dump 1.12.0 through 1.13.0 allows… CVSS 3.1HIGH 7.5
  • TI-2026-26978 HDF5: H5T__conv_struct Use After Free CVSS 3.1HIGH 7.8
  • TI-2022-09532 Heap-based buffer overflow in HDF Group libhdf5 CVSS 3.1HIGH 7.8
See all 150 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences