CVE-2026-109361: Deserialization of Untrusted Data in Project-MONAI MONAI
Description
MONAI 1.2.0 before 1.6.1 contains an insecure deserialization vulnerability in nnUNetV2Runner that unpickles the postprocessing_file path read from inference_information.json without confining it to the results directory. Attackers who can modify inference_information.json can point it at a malicious pickle elsewhere on the filesystem to execute code when predict_ensemble_postprocessing runs.
CVSS v4.0
Score 7.0high
Affected software
Project-MONAI
MONAI
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in Project-MONAI's MONAI software affects versions from 1.2.0 up to but not including 1.6.1. It arises from insecure deserialization in the nnUNetV2Runner, where the postprocessing_file path read from inference_information.json is unpickled without confinement to the results directory. An attacker with the ability to alter inference_information.json can specify a malicious pickle file located elsewhere on the filesystem, leading to arbitrary code execution when the predict_ensemble_postprocessing function runs.
Potential Impact
Successful exploitation allows an attacker with write access to inference_information.json to execute arbitrary code on the system running MONAI. This can lead to full compromise of the affected environment. The CVSS 4.0 base score is 7, indicating a high severity vulnerability with local attack vector, low attack complexity, and requiring low privileges but user interaction.
Mitigation Recommendations
A fix is available in MONAI version 1.6.1 and later. Users should upgrade to version 1.6.1 or newer to remediate this vulnerability. Until then, restrict write access to inference_information.json and avoid running untrusted inference jobs. Patch status is confirmed by the affectedVersions field indicating versions before 1.6.1 are vulnerable.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-10-12T14:21:32.594Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6acd0c192cdf04f656b11c16
Added to database: 10/12/2026, 16:34:33 UTC
Last enriched: 10/12/2026, 16:48:39 UTC
Last updated: 10/12/2026, 21:46:38 UTC
Views: 9
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