CVE-2026-29043 HDF5 H5T__ref_mem_setnull Heap Buffer Overflow
An attacker can trigger a heap buffer overflow in HDF5 via a malicious file, causing denial of service or potential remote code execution.
- 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-2026-29043?
CVE-2026-29043 is a medium-severity memory corruption vulnerability in Hdfgroup Hdf5, published on 10 Apr 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
HDF5 is software for managing data. In 1.14.1-2 and earlier, an attacker who can control an h5 file parsed by HDF5 can trigger a write-based heap buffer overflow condition in the H5T__ref_mem_setnull method. This can lead to a denial-of-service condition, and potentially further issues such as remote code execution depending on the practical exploitability of the heap overflow against modern operating systems.
Weakness: CWE-122
Which versions are affected by CVE-2026-29043?
It affects 1 product.
Products include Hdfgroup Hdf5.
How do I fix CVE-2026-29043?
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-2026-29043 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-29043 exists.
Other vulnerabilities in Hdfgroup Hdf5
Sources
Also known as DEBIAN-CVE-2026-29043, ECHO-0f49-5d12-5bd0, GHSA-qm2m-5g5w-2277, JLSEC-2026-353, UBUNTU-CVE-2026-29043.