Buffer overflow in Unidata Netcdf-C
CVE-2026-86095
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.002 (7.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 8th percentile — 7.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.002 · change: +0.001
Affected products
Weakness classification (CWE)
References
- github.com/Unidata/netcdf-c (product)
- github.com/Unidata/netcdf-c/blob/v4.10.1/libhdf5/hdf5attr.c (technical-description)
- www.vulncheck.com/advisories/unidata-netcdf-c-through-4.10.1-out-of-bounds-writ… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-86095?
- CVE-2026-86095 is a high-severity vulnerability in Unidata Netcdf-C, classified under Out-of-bounds Write. CVSS score: 7.8/10. Published 2026-09-04.
- How severe is CVE-2026-86095?
- High severity. CVSS v3 base score is 7.8 out of 10.