CVE-2026-106547 HDF5 heap buffer overflow in H5VM_array_fill via crafted fill-value metadata
A heap buffer overflow in HDF5 allows remote attackers to execute arbitrary code or crash applications via crafted file metadata.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-106547?
CVE-2026-106547 is a high-severity memory corruption vulnerability in The HDF Group HDF5, published on 6 Oct 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
A heap-based buffer overflow in H5VM_array_fill() in src/H5VM.c in HDF5 before 2.2.0 lets a remote attacker cause an application crash and possibly execute arbitrary code with a crafted HDF5 file. When a dataset's unallocated chunks are read, H5D__fill_init() fills the fill-value buffer from datatype and dataspace metadata in the file. If that metadata is inconsistent with the buffer's allocated size, the write goes past the end of the buffer. The attacker can control the content written through the fill value stored in the file.
Weakness: CWE-122
Which versions are affected by CVE-2026-106547?
How do I fix CVE-2026-106547?
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-2026-106547 being exploited?
There is no known exploitation of CVE-2026-106547 in the wild and no public exploit code.
Sources
Also known as AZL-106679, DEBIAN-CVE-2026-106547, ECHO-f72a-4ae2-b841, GHSA-p24g-8x6r-2v93, UBUNTU-CVE-2026-106547.