CVE-2026-26200HDF5 is software for managing data.
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No exploitation reported and no EPSS estimate yet.
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HDF5 is software for managing data. Prior to version 1.14.4-2, an attacker who can control an `h5` file parsed by HDF5 can trigger a write-based heap buffer overflow condition. 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. Real-world exploitability of this issue in terms of remote-code execution is currently unknown. Version 1.14.4-2 fixes the issue.
- CVSS
- 7.8 HIGH (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-122, CWE-787, CWE-131
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Modified
- Record last updated
- Jul 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
hdfgroup hdf5 hdfgroup:hdf5 | before 1.14.4.2 | NVD |
References
- https://github.com/HDFGroup/hdf5/security/advisories/GHSA-5p2m-j456-9mr2exploit, third-party-advisory
- https://access.redhat.com/security/cve/CVE-2026-26200
- https://bugzilla.redhat.com/show_bug.cgi?id=2441088
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-26200.json
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.