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CVE-2026-19024: HDF5 H5Pget_fill_value NULL Pointer Dereference via Malformed Fill Value Message

unknownCVE-2026-19024

CSIRTS triage

vendor: HDF5product: HDF5Denial of service
What
H5Pget_fill_value function dereferences a null pointer when processing malformed fill value messages.
Who is affected
Deployments processing untrusted HDF5 files with crafted fill value metadata.
Urgency
Moderate; null pointer dereference causes denial of service to HDF5 applications.
Action
Update to a patched HDF5 version that validates fill value message structure.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
unknown
Published
2026-08-06
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-19024

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-19024coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for HDF5 H5Pget_fill_value NULL

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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