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CVE-2026-26200

HDF5 Affected by H5T__conv_struct_opt Heap Buffer Overflow

Published: Feb 19, 2026Updated: Feb 20, 2026 Sources: CVE List NVDCWE-122
NVD MITRE
7.8CVSSHIGH
EPSS Score
0.2%
Top 86.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

Description

HDF5 is software for managing data. Prior to version 1.14.4-2, an attacker who can control an `h5` file parsed by HDF5 can trigger a write-based heap buffer overflow condition. This can lead to a denial-of-service condition, and potentially further issues such as remote code execution depending on the practical exploitability of the heap overflow against modern operating systems. Real-world exploitability of this issue in terms of remote-code execution is currently unknown. Version 1.14.4-2 fixes the issue.

CVSS Vector Breakdown

AV:LAC:LPR:NUI:RS:UC:HI:HA:H
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-122CWE-787

Affected Products

hdf5HDFGroup
LibraryLibrary
Databases
hdf5hdfgroup
LibraryLibrary
Databases
hdfgrouposs-projectUSDatabasesaka hdf5

Attack Graph

Products CVE Techniques Tactics

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Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://github.com/HDFGroup/hdf5/security/advisories/GHSA-5p2m-j456-9mr2
github.com

Timeline

Published
Feb 19, 2026
Last Updated
Feb 20, 2026

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