What is CVE-2026-26200?

CVE-2026-26200 is a high-severity vulnerability in Hdfgroup Hdf5, classified under Heap-based Buffer Overflow. CVSS score: 7.8/10. Published 2026-02-19.

How severe is CVE-2026-26200?

High severity. CVSS v3 base score is 7.8 out of 10.

Buffer overflow in Hdfgroup Hdf5

CVE-2026-26200

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 potentiall…

Vulnerability class: Buffer Overflow

EPSS: 0.001 (18.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Hdfgroup Hdf5 — versions < 1.14.4-2

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow

References

https://github.com/HDFGroup/hdf5/security/advisories/GHSA-5p2m-j456-9mr2 (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-26200?: CVE-2026-26200 is a high-severity vulnerability in Hdfgroup Hdf5, classified under Heap-based Buffer Overflow. CVSS score: 7.8/10. Published 2026-02-19.
How severe is CVE-2026-26200?: High severity. CVSS v3 base score is 7.8 out of 10.