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CVE-2026-19023: HDF5 h5dump Untrusted Pointer Dereference in Binary Output of Variable-Length String Datasets

unknownCVE-2026-19023

CSIRTS triage

vendor: HDF5product: HDF5Memory corruption
What
Untrusted pointer dereference in h5dump tool when processing variable-length string datasets in binary mode.
Who is affected
Users running h5dump on untrusted HDF5 files with variable-length string datasets.
Urgency
Severity unknown; pointer dereference can cause crash or code execution.
Action
Update HDF5 to patched version or avoid processing untrusted binary datasets with h5dump.

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-2026-19023

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-2026-19023coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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

Recent advisories for HDF5 h5dump Untrusted

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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