CVE-2026-26200
📋 TL;DR
This CVE describes a heap buffer overflow vulnerability in HDF5 software that allows attackers to trigger denial-of-service conditions through specially crafted HDF5 files. If successfully exploited, it could potentially lead to remote code execution, though real-world exploitability for RCE is currently unknown. Any system using HDF5 versions before 1.14.4-2 to parse untrusted HDF5 files is affected.
💻 Affected Systems
- HDF5
📦 What is this software?
Hdf5 by Hdfgroup
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise if an attacker can deliver a malicious HDF5 file and the heap overflow is practically exploitable on the target system.
Likely Case
Denial-of-service through application crashes when processing malicious HDF5 files, potentially disrupting data processing workflows.
If Mitigated
Limited impact with proper input validation and file source restrictions, though the vulnerability still exists in the codebase.
🎯 Exploit Status
Exploitation requires delivering a malicious HDF5 file to a vulnerable system. Real-world RCE exploitability is unknown and would depend on specific heap layout and mitigations.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.14.4-2
Vendor Advisory: https://github.com/HDFGroup/hdf5/security/advisories/GHSA-5p2m-j456-9mr2
Restart Required: Yes
Instructions:
1. Download HDF5 version 1.14.4-2 or later from official sources. 2. Replace existing HDF5 installation with patched version. 3. Restart any applications using HDF5 library. 4. Recompile any applications statically linked to HDF5.
🔧 Temporary Workarounds
Restrict HDF5 file sources
allOnly allow HDF5 files from trusted sources and implement file validation before processing.
Sandbox HDF5 processing
linuxRun HDF5 file processing in isolated containers or sandboxes with limited privileges.
docker run --read-only --cap-drop=ALL -v /trusted/files:/input hdf5-processor
🧯 If You Can't Patch
- Implement strict file upload validation and only accept HDF5 files from authenticated, trusted sources
- Deploy application-level monitoring for crashes or abnormal behavior in HDF5 processing components
🔍 How to Verify
Check if Vulnerable:
Check HDF5 version with 'h5dump --version' or examine linked libraries in applications using HDF5Check Version:
h5dump --version | grep -i versionVerify Fix Applied:
Confirm version is 1.14.4-2 or later using 'h5dump --version' command📡 Detection & Monitoring
Log Indicators:
- Application crashes when processing HDF5 files
- Memory access violation errors in application logs
- Segmentation faults in HDF5-related processes
Network Indicators:
- Unusual HDF5 file uploads to applications
- Large or malformed HDF5 file transfers
SIEM Query:
source="application.logs" AND ("segmentation fault" OR "heap overflow" OR "buffer overflow") AND process="*hdf5*"