Service crash via out-of-bounds null-byte write
Published Apr 10, 2026 · Updated Apr 10, 2026
Heap-based buffer overflow in HDF5 1.14.1-2 and earlier allows attackers to crash a parser by supplying a crafted H5 file. H5T__ref_mem_setnull calls memset to write 64 null bytes past a 16-byte heap allocation while converting crafted reference data. Exploitation requires a target to parse the file with h5dump, h5stat, or another affected consumer; the published proof of concept demonstrates an abort, while code execution is unproven.
Summary
What happened
Heap-based buffer overflow in HDF5 1.14.1-2 and earlier allows attackers to crash a parser by supplying a crafted H5 file. H5T__ref_mem_setnull calls memset to write 64 null bytes past a 16-byte heap allocation while converting crafted reference data. Exploitation requires a target to parse the file with h5dump, h5stat, or another affected consumer; the published proof of concept demonstrates an abort, while code execution is unproven.
The record
- CVE
- CVE-2026-29043
- Published
- Apr 10, 2026
- Updated
- Apr 10, 2026
- Vendor
- The HDF Group
- Product
- HDF5
- Classifications
- CWE-122, T1204.002
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 10, 2026CVE publishedPublication date reported by the CVE source.
- Apr 10, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=<= 1.14.1-2
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- H5T__ref_mem_setnull crafted H5 proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
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