| Name | CVE-2026-26199 |
| Description | HDF5 is a high-performance library and a file format specification that implements the HDF5 data model. If `H5Iget_name` is invoked on a group id with `0` for the size parameter, it will underflow when trying to place a null terminator in the buffer. This can occur if `H5Iget_name` is invoked in a way where `size` can be forced to zero, and there is important data before the `name` buffer. |
| 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) | | | |
Notes
[trixie] - hdf5 <no-dsa> (Minor issue)
[bookworm] - hdf5 <postponed> (Minor issue; H5G_get_name buffer underflow only when caller passes size=0 to H5Iget_name)
[bullseye] - hdf5 <postponed> (Minor issue; H5G_get_name buffer underflow only when caller passes size=0 to H5Iget_name)
https://github.com/HDFGroup/hdf5/security/advisories/GHSA-5c6x-jmgf-f5vc
isolate fixing commit