Vulnerability · Published Apr 10, 2026 · Assigned by GitHub_M
CVE-2026-29043HDF5 H5T__ref_mem_setnull Heap Buffer Overflow
Medium 5.5
In plain English
A medium-severity heap buffer overflow in hdf5 from HDFGroup. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 12% of all known vulnerabilities).
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | hdf5 | no fix listed | DEBIAN-CVE-2026-29043 |
| Debian:13 | hdf5 | no fix listed | DEBIAN-CVE-2026-29043 |
| Debian:14 | hdf5 | no fix listed | DEBIAN-CVE-2026-29043 |
| Ubuntu:22.04:LTS | hdf5 | no fix listed | UBUNTU-CVE-2026-29043 |
| Ubuntu:24.04:LTS | hdf5 | no fix listed | UBUNTU-CVE-2026-29043 |
| Ubuntu:25.10 | hdf5 | no fix listed | UBUNTU-CVE-2026-29043 |
| Ubuntu:26.04:LTS | hdf5 | no fix listed | UBUNTU-CVE-2026-29043 |
| Ubuntu:26.10 | hdf5 | no fix listed | UBUNTU-CVE-2026-29043 |
Affected products (as reported)
Weakness: CWE-122 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
References
- https://github.com/HDFGroup/hdf5/security/advisories/GHSA-qm2m-5g5w-2277 x_refsource_CONFIRM