CVE-2026-86095: Unidata Netcdf-C

High severity, CVSS 7.8. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Unidata Netcdf-C: up to and including 4.10.1

Published 2026-09-04. Last modified 2026-09-24.