CVE-2026-17583 Overview
CVE-2026-17583 affects Thermo Fisher Applied Biosystems Genetic Analyzers. The vulnerability allows local attackers to edit .fsa and .hid output files produced by the analyzers. Because these files lack integrity validation, an attacker can tamper with them to alter DNA data and produce inaccurate DNA test outcomes.
The weakness is categorized as [CWE-353] Missing Support for Integrity Check. The flaw affects the trustworthiness of forensic and clinical DNA analysis outputs, which are relied upon for identification, paternity, and diagnostic workflows.
Critical Impact
Local attackers with access to genetic analyzer output files can modify DNA analysis results without detection, undermining forensic, clinical, and research findings.
Affected Products
- Thermo Fisher Applied Biosystems Genetic Analyzers
- .fsa output files generated by the analyzers
- .hid output files generated by the analyzers
Discovery Timeline
- 2026-08-05 - CVE-2026-17583 published to NVD
- 2026-08-05 - Last updated in NVD database
Technical Details for CVE-2026-17583
Vulnerability Analysis
The vulnerability stems from missing integrity protection on the analyzer's output files. Applied Biosystems Genetic Analyzers write DNA fragment data to .fsa and .hid files during capillary electrophoresis runs. These files store electropherogram data used for downstream genotype and sequence interpretation.
The files can be opened and edited without any cryptographic signature, checksum verification, or tamper-evidence mechanism. Any user with local file access can modify allele calls, peak data, or sample metadata. Downstream analysis software will process the tampered file as authentic, producing incorrect DNA results.
This category of flaw is significant in medical and forensic environments where evidentiary integrity is required. The attack requires local access but does not require privileges or user interaction on the target host.
Root Cause
The root cause is the absence of an integrity verification layer around genetic analyzer output data. The .fsa and .hid file formats do not embed digital signatures or hash-based message authentication codes tied to the instrument. Consumers of these files cannot distinguish between original instrument output and modified content.
Attack Vector
An attacker requires local access to the workstation or shared storage location holding .fsa or .hid files. The adversary opens the file with an editor capable of interpreting the format and modifies the trace data. The tampered file is then processed by analysis pipelines, which return altered DNA outcomes.
Exploitation does not require network access, authentication, or user interaction on the affected host. Refer to the Thermo Fisher Product Bulletin and CISA Medical Advisory ICSMA-26-216-01 for technical details.
Detection Methods for CVE-2026-17583
Indicators of Compromise
- Unexpected modification timestamps on .fsa or .hid files after the instrument run has completed.
- File hash mismatches between the initial instrument export and the file used by downstream analysis software.
- Access events to genetic analyzer output directories by user accounts not associated with lab operators.
Detection Strategies
- Compute and store cryptographic hashes (SHA-256) of .fsa and .hid files immediately after instrument export, then compare before analysis.
- Enable file integrity monitoring on directories that hold analyzer output and forward events to a centralized log store.
- Correlate file-modification events with authenticated user sessions to identify unauthorized edits.
Monitoring Recommendations
- Monitor host and share-level audit logs for write or rename operations targeting .fsa and .hid files.
- Alert on process executions that open analyzer output files with editors or hex tools rather than approved analysis applications.
- Review privileged and service-account activity on genetic analyzer workstations on a scheduled cadence.
How to Mitigate CVE-2026-17583
Immediate Actions Required
- Restrict file system permissions on directories containing .fsa and .hid files to authorized lab personnel only.
- Move analyzer output to write-once or append-only storage as soon as it is generated.
- Generate and archive SHA-256 hashes for every output file at creation time and validate before any downstream analysis.
Patch Information
Consult the Thermo Fisher Product Bulletin and CISA Medical Advisory ICSMA-26-216-01 for vendor guidance and any available updates. The CVE Record CVE-2026-17583 tracks additional references as they are published.
Workarounds
- Isolate genetic analyzer workstations from general-purpose networks and restrict interactive logon to lab operators.
- Require multi-user chain-of-custody procedures for handling .fsa and .hid files intended for forensic or clinical use.
- Store a read-only master copy of each analyzer output on separate media and treat any deviation from the master hash as evidence of tampering.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
