Buffer overflow in Hdfgroup Hdf5
CVE-2026-29043
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.002 (9.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 9th percentile — 9.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: -0.000
Affected products
- Hdfgroup Hdf5 — versions <= 1.14.1-2
Weakness classification (CWE)
References
- github.com/HDFGroup/hdf5/security/advisories/GHSA-qm2m-5g5w-2277 (Exploit, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-29043?
- CVE-2026-29043 is a medium-severity vulnerability in Hdfgroup Hdf5, classified under Heap-based Buffer Overflow. CVSS score: 5.5/10. Published 2026-04-10.
- How severe is CVE-2026-29043?
- Medium severity. CVSS v3 base score is 5.5 out of 10.