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OpenAdvisories
High · 7.8 CVE-2026-26200 EUVD-2026-7979

HDF5 Affected by H5T__conv_struct_opt Heap Buffer Overflow

Published Feb 19, 2026 · Updated Jul 15, 2026 · Assigned by GitHub_M

Description

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.

Affected products

VendorProductAffectedFixed
HDFGroup hdf5 < 1.14.4-2 —

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

ReleasePackageFixed inAdvisory
Debian 14 hdf5 No fix yet —
Debian 13 hdf5 No fix yet —
Debian 12 hdf5 No fix yet —
ReleasePackageFixed inAdvisory
Ubuntu 26.10 hdf5 No fix yet —
Ubuntu 26.04 LTS hdf5 No fix yet —
Ubuntu 25.10 hdf5 No fix yet —
Ubuntu 24.04 LTS hdf5 No fix yet —
Ubuntu 22.04 LTS hdf5 No fix yet —
Show 4 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu Pro 20.04 LTS hdf5 No fix yet —
Ubuntu Pro 18.04 LTS hdf5 No fix yet —
Ubuntu Pro 16.04 LTS hdf5 No fix yet —
Ubuntu Pro 14.04 LTS hdf5 No fix yet —

References