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Vulnerability · Published Sep 4, 2026 · Assigned by VulnCheck

CVE-2026-86095Unidata netcdf-c through 4.10.1 Out-of-bounds Write via Oversized HDF5 Attribute Name

High 7.8

In plain English

A high-severity out-of-bounds write in netcdf-c from Unidata. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 8% of all known vulnerabilities).

Severity (CVSS 3.1)7.8High
Exploit odds (30 days)0.2%top 91.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12netcdfno fix listedDEBIAN-CVE-2026-86095
Debian:13netcdfno fix listedDEBIAN-CVE-2026-86095
Debian:14netcdfno fix listedDEBIAN-CVE-2026-86095
Debian:12netcdf-parallelno fix listedDEBIAN-CVE-2026-86095
Debian:13netcdf-parallelno fix listedDEBIAN-CVE-2026-86095
Debian:14netcdf-parallelno fix listedDEBIAN-CVE-2026-86095
Ubuntu:22.04:LTSnetcdfno fix listedUBUNTU-CVE-2026-86095
Ubuntu:24.04:LTSnetcdfno fix listedUBUNTU-CVE-2026-86095
Ubuntu:26.04:LTSnetcdfno fix listedUBUNTU-CVE-2026-86095
Ubuntu:26.10netcdfno fix listedUBUNTU-CVE-2026-86095
Ubuntu:22.04:LTSnetcdf-parallelno fix listedUBUNTU-CVE-2026-86095
Ubuntu:24.04:LTSnetcdf-parallelno fix listedUBUNTU-CVE-2026-86095
Ubuntu:26.04:LTSnetcdf-parallelno fix listedUBUNTU-CVE-2026-86095
Ubuntu:26.10netcdf-parallelno fix listedUBUNTU-CVE-2026-86095

Affected products (as reported)

VendorProductVersions
Unidata netcdf-c 0 – through 4.10.1

Weakness: CWE-787 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References