Quick answers
- Is CVE-2026-17573 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-17573 being exploited in the wild.
- How severe is CVE-2026-17573?
- Informational severity, with a CVSS score of 6.7, published 27 July 2026.
- Which products and versions are affected?
- The HDF Group HDF5 <= 2.1.1.
- Is there a fix for CVE-2026-17573?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-17573 attacked?
- It is attacked with local access, in a software library.
- Am I affected by CVE-2026-17573?
- Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A double free vulnerability (CWE-415) exists in the HDF5 library, specifically within the h5repack utility. The issue is triggered when the utility processes a crafted HDF5 file that contains an oversized chunk size field. This improper memory management occurs during file processing, leading to an application crash (denial of service). Exploitation requires a local attacker to provide a malicious file that is then processed by a user or automated system using h5repack. The vulnerability is reported to affect versions up to and including 2.1.1 on Linux platforms.
Affected products
- The HDF Group HDF5 <= 2.1.1
Timeline
- 2026-07-27: disclosed: CVE published to NVD dataset