CVE-2026-26199
Published:July 20, 2026
Updated:August 06, 2026
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.
Affected Packages
https://github.com/HDFGroup/hdf5.git (GITHUB):
Affected version(s) >=hdf5-1_14_0 <hdf5_2.1.0Fix Suggestion:
Update to version hdf5_2.1.0Related Resources (4)
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Contact UsCVSS v4
Base Score:
5.9
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
ACTIVE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Buffer Underwrite ('Buffer Underflow')
EPSS
Base Score:
0.26