CVE-2026-26200

Name	CVE-2026-26200
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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
hdf5 (PTS)	bullseye	1.10.6+repack-4+deb11u1	vulnerable
	bookworm	1.10.8+repack1-1	vulnerable
	trixie	1.14.5+repack-3	vulnerable
	forky, sid	1.14.6+repack-2	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
hdf5	source	(unstable)	(unfixed)	unimportant

Notes

https://github.com/HDFGroup/hdf5/security/advisories/GHSA-5p2m-j456-9mr2
said to be fixed in 1.14.4-2 upstream
HDF not covered by security support, see https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1117722