What is CVE-2026-17573?

CVE-2026-17573 is a medium-severity vulnerability in Hdfgroup Hdf5, classified under Double Free. CVSS score: 5.5/10. Published 2026-07-27.

How severe is CVE-2026-17573?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Double Free in Hdfgroup Hdf5

CVE-2026-17573

A double free vulnerability was discovered in the HDF5 library. Processing a crafted HDF5 file containing an oversized chunk size field via h5repack may cause the application to abort due to a double free.

Vulnerability class: Double Free

Published 2026-07-27 · last modified 2026-10-24.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.002 (4.3th percentile), scored 2026-11-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 4th percentile — 4.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Hdfgroup Hdf5
The Hdf Group Hdf5 — versions <= 2.1.1

Weakness classification (CWE)

CWE-415 — Double Free

References

0253b833-3e77-4dfe-9d57-17db1a2f0a74 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2026-17573?: CVE-2026-17573 is a medium-severity vulnerability in Hdfgroup Hdf5, classified under Double Free. CVSS score: 5.5/10. Published 2026-07-27.
How severe is CVE-2026-17573?: Medium severity. CVSS v3 base score is 5.5 out of 10.