CVE-2026-19024
NULL deref in HDF5 H5Pget_fill_value allows DoS via crafted dataset
Is CVE-2026-19024 being exploited?
Not confirmed. CVE-2026-19024 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.13% probability of exploitation in the next 30 days.
How severe is CVE-2026-19024?
CVE-2026-19024 is rated High with a CVSS score of 8.2. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-19024?
Yes. A fix has been recorded for CVE-2026-19024. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-19024 affect?
CVE-2026-19024 affects HDF5 < 2.1.1, Applications/services linking HDF5 (scientific/data tools). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-19024?
Upgrade HDF5 to 2.1.1 or later and rebuild dependent applications.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Crafted HDF5 files can trigger a NULL pointer dereference, crashing applications and causing denial of service.
Patch when possible
- affected<= 2.3.0
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.