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CVE-2026-26200

Hdfgroup Hdf5 remote code execution

7.8 HIGHPublic exploitEPSS 0.37%
  1. Published19 Feb 2026

Description

HDF5 is software for managing data. Prior to version 1.14.4-2, an attacker who can control an `h5` file parsed by HDF5 can trigger a write-based heap buffer overflow condition. This can lead to a denial-of-service condition, and potentially further issues such as remote code execution depending on the practical exploitability of the heap overflow against modern operating systems. Real-world exploitability of this issue in terms of remote-code execution is currently unknown. Version 1.14.4-2 fixes the issue.

CVSS 3.1 breakdown

Attack vectorLocal
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

Hdfgroup Hdf5< 1.14.4.2

Remediation

Fixed in
Hdfgroup Hdf5≥ 1.14.4.2

References

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Frequently asked

Is CVE-2026-26200 being actively exploited?

CVE-2026-26200 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.37%.

How severe is CVE-2026-26200?

CVE-2026-26200 has a CVSS 3.1 base score of 7.8, rated high. EPSS estimates a 0.37% probability of exploitation.

Which products are affected by CVE-2026-26200?

Affected products include Hdfgroup Hdf5.

How do I fix CVE-2026-26200?

Upgrade affected software to a fixed version, for example Hdfgroup Hdf5 1.14.4.2 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-26200 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.