CVE-2025-6858 HDF5 H5Centry.c H5C__flush_single_entry null pointer dereference

Medium 4.8 Published 29 Jun 2025 Updated 30 Jun 2025

A local attacker can cause a denial of service via null pointer dereference in the HDF5 library's cache entry flushing function.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: Available

What is CVE-2025-6858?

CVE-2025-6858 is a medium-severity vulnerability in Hdfgroup Hdf5, published on 29 Jun 2025. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A vulnerability was found in HDF5 1.14.6 and classified as problematic. Affected by this issue is the function H5C__flush_single_entry of the file src/H5Centry.c. The manipulation leads to null pointer dereference. The attack needs to be approached locally. The exploit has been disclosed to the public and may be used.

Weakness: CWE-476, CWE-404

Which versions are affected by CVE-2025-6858?

It affects 1 product.

Products include Hdfgroup Hdf5.

How do I fix CVE-2025-6858?

Upgrade to a fixed version.

Is CVE-2025-6858 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-6858 exists.

All Hdfgroup Hdf5 vulnerabilities

Sources

Also known as AZL-64407, AZL-64428, DEBIAN-CVE-2025-6858, ECHO-c189-e8df-c780, GHSA-8fpg-65fw-rjmf, JLSEC-2026-348 and 1 more.