CVE-2026-17573 The HDF Group CVE debrief

Who should care

Users of the HDF5 library, particularly those who process HDF5 files from untrusted sources, should be aware of this vulnerability and take steps to mitigate it. This includes developers integrating HDF5 into their applications, administrators managing systems that process HDF5 files, and security teams responsible for vulnerability management.

Technical summary

The HDF5 library is vulnerable to a double free vulnerability. This occurs when the library attempts to free the same memory location twice, leading to undefined behavior. An attacker could potentially exploit this vulnerability by crafting a malicious HDF5 file that triggers the double free condition. Successful exploitation may lead to application crashes or potentially allow for code execution.

Defensive priority

Medium

Recommended defensive actions

• Inventory and assess HDF5 library usage in your environment
• Apply patches or updates provided by the HDF5 library maintainers
• Implement input validation and sanitization for HDF5 files
• Monitor for suspicious activity related to HDF5 file processing
• Review compensating controls for exposed systems while remediation is scheduled and verified

Evidence notes

The CVE record was published on 2026-07-27T16:17:04.807Z and last modified on 2026-07-27T18:16:54.630Z. The NVD entry is currently Unclassified. Evidence is limited to public sources and may not reflect the full scope of affected products or potential impacts. Defenders should verify the vulnerability's relevance to their environment and review official advisories for specific guidance.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.