🛡️ CVE-2026-26199 — hdf5

🟡 CVSS 6.5 — Medium ⚠️ Exploit Public CWE-124 NVD
6.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

HDF5 is a high-performance library and a file format specification that implements the HDF5 data model. If H5Iget_name is invoked on a group id with 0 for the size parameter, it will underflow when trying to place a null terminator in the buffer. This can occur if H5Iget_name is invoked in a way where size can be forced to zero, and there is important data before the name buffer.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity low, availability low.

Affected software

CVE-2026-26199 is recorded against 1 package.

  • hdf5 (fixed in 2.1.0)

Timeline and source

Published on 20 July 2026 and last revised on 29 July 2026. A public exploit is known to exist, which raises the urgency of patching considerably. Record sourced from NVD.

References

github.com
github.com
github.com

Details

Severity MEDIUM
CVSS Score 6.5
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
CWE CWE-124
Public Exploit ⚠️ Yes
Source NVD
Published 2026-07-20
Updated 2026-08-11
Modified 2026-07-29
Fix URL N/A

Affected Packages

Software From version Fixed in
hdf5 — 2.1.0

Similar Threats

Exploit Protection

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CVE-2026-26199 carries CVSS 6.5 Medium rating and a public exploit already exists. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.

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