CVE-2026-86095 Unidata netcdf-c through 4.10.1 Out-of-bounds Write via Oversized HDF5 Attribute Name
Attackers can cause memory corruption and crashes in applications using netcdf-c by providing crafted HDF5 files with oversized attribute names.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-86095?
CVE-2026-86095 is a high-severity memory corruption vulnerability in Unidata netcdf-c, published on 4 Sep 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
Unidata netcdf-c through 4.10.1 contains an out-of-bounds write vulnerability in NC4_HDF5_inq_attname() that copies HDF5 attribute names into a fixed 256-byte buffer without length validation. Attackers can craft HDF5 files with oversized attribute names to overflow the destination buffer, causing memory corruption and crashes when applications enumerate attribute names.
Weakness: CWE-787
Which versions are affected by CVE-2026-86095?
Linux distribution packages (10)
netcdf SUSE:Linux Enterprise Module for Package Hub 15 SP7 | All versions | 4.7.4-150600.15.5.1 |
netcdf-openmpi2 SUSE:Linux Enterprise Module for Package Hub 15 SP7 | All versions | 4.7.4-150600.15.5.1 |
netcdf-openmpi3 SUSE:Linux Enterprise Module for Package Hub 15 SP7 | All versions | 4.7.4-150600.15.5.1 |
netcdf-openmpi4 SUSE:Linux Enterprise Module for Package Hub 15 SP7 | All versions | 4.7.4-150600.15.5.1 |
netcdf_4_7_4-gnu-hpc SUSE:Linux Enterprise Module for Package Hub 15 SP7 | All versions | 4.7.4-150600.15.5.1 |
netcdf_4_7_4-gnu-mpich-hpc SUSE:Linux Enterprise Module for Package Hub 15 SP7 | All versions | 4.7.4-150600.15.5.1 |
netcdf_4_7_4-gnu-mvapich2-hpc SUSE:Linux Enterprise Module for Package Hub 15 SP7 | All versions | 4.7.4-150600.15.5.1 |
netcdf_4_7_4-gnu-openmpi2-hpc SUSE:Linux Enterprise Module for Package Hub 15 SP7 | All versions | 4.7.4-150600.15.5.1 |
netcdf_4_7_4-gnu-openmpi3-hpc SUSE:Linux Enterprise Module for Package Hub 15 SP7 | All versions | 4.7.4-150600.15.5.1 |
netcdf_4_7_4-gnu-openmpi4-hpc SUSE:Linux Enterprise Module for Package Hub 15 SP7 | All versions | 4.7.4-150600.15.5.1 |
How do I fix CVE-2026-86095?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-86095 being exploited?
There is no known exploitation of CVE-2026-86095 in the wild and no public exploit code.
Sources
Also known as AZL-99894, DEBIAN-CVE-2026-86095, ECHO-9fe9-af29-5ad7, GHSA-mm3m-jp7w-cj3m, SUSE-SU-2026:4249-1, UBUNTU-CVE-2026-86095.