CVE-2026-26199

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.

Is your site exposed to CVE-2026-26199?

Run a free security scan — no signup, results in seconds.

Weakness Type (CWE)

CWE-124 CWE-124

References

Other References

https://github.com/HDFGroup/hdf5/blob/develop/src/H5Gname.c#L474 https://github.com/HDFGroup/hdf5/security/advisories/GHSA-5c6x-jmgf-f5vc https://github.com/HDFGroup/hdf5/security/advisories/GHSA-5c6x-jmgf-f5vc

Frequently Asked Questions

What is CVE-2026-26199? +

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 do I check if I'm vulnerable to CVE-2026-26199? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2024-36343

Improper input validation in the System Management Mode (SMM) communications buffer could allow a privileged attacker to perform an out …

CVE-2026-44631 9.8

Buffer Underwrite vulnerability in Apache HTTP Server on crafted regular expressions in the configuration. This issue affects Apache HTTP Server: …

CVE-2023-25610 9.8

A buffer underwrite ('buffer underflow') vulnerability in the administrative interface of Fortinet FortiOS version 7.2.0 through 7.2.3, version 7.0.0 through …

CVE-2025-27440 8.5

Heap overflow in some Zoom Workplace Apps may allow an authenticated user to conduct an escalation of privilege via network …

CVE-2025-27439 8.5

Buffer underflow in some Zoom Workplace Apps may allow an authenticated user to conduct an escalation of privilege via network …

CVE-2026-34253 8.2

A buffer underflow vulnerability has been identified in the ogg123 utility from the vorbis-tools 1.4.3 package in function remotethread in …