CVE-2025-6750 HDF5 H5Omtime.c H5O__mtime_new_encode heap-based overflow
A heap-based buffer overflow in HDF5 allows local attackers to execute arbitrary code or cause denial of service via crafted files.
- 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-2025-6750?
CVE-2025-6750 is a medium-severity memory corruption vulnerability in Hdfgroup Hdf5, published on 27 Jun 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability, which was classified as problematic, has been found in HDF5 1.14.6. Affected by this issue is the function H5O__mtime_new_encode of the file src/H5Omtime.c. The manipulation leads to heap-based buffer overflow. Attacking locally is a requirement. The exploit has been disclosed to the public and may be used.
Which versions are affected by CVE-2025-6750?
It affects 1 product.
Products include Hdfgroup Hdf5.
How do I fix CVE-2025-6750?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2025-6750 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-6750 exists.
Other vulnerabilities in Hdfgroup Hdf5
Sources
Also known as AZL-64422, AZL-64440, DEBIAN-CVE-2025-6750, ECHO-c376-97bb-2492, GHSA-vvrm-jv2m-hrg6, JLSEC-2026-342 and 1 more.