What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-04 · updated 2026-09-24
• Weakness: CWE-787

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 products

• Unidata netcdf-c: through 4.10.1

References

• https://github.com/Unidata/netcdf-c
• https://github.com/Unidata/netcdf-c/blob/v4.10.1/libhdf5/hdf5attr.c
• https://www.vulncheck.com/advisories/unidata-netcdf-c-through-4.10.1-out-of-bounds-write-via-oversized-hdf5-attribute-name

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