CVE-2025-6856: Hdfgroup HDF5

High severity, CVSS 7.8. EPSS: 0.2% chance of exploitation in the next 30 days.

A vulnerability, which was classified as problematic, was found in HDF5 1.14.6. Affected is the function H5FL__reg_gc_list of the file src/H5FL.c. The manipulation leads to use after free. Attacking locally is a requirement. The exploit has been disclosed to the public and may be used.

Affected products

Published 2025-06-29. Last modified 2026-06-17.