MONAI before 1.5.2 contains a deserialization of untrusted data vulnerability in the algo_from_pickle function in monai/auto3dseg/utils.py. (CVE-2026-100846)
MONAI versions prior to 1.5.2 contain a vulnerability in the algo_from_pickle function that allows deserialization of untrusted data. This function reads a .pkl file and directly passes its contents to pickle.loads without validating the source or content. An attacker supplying a crafted pickle file can trigger arbitrary code execution during deserialization.
AI Analysis
Technical Summary
The vulnerability in MONAI before version 1.5.2 exists in the algo_from_pickle function located in monai/auto3dseg/utils.py. This function deserializes data from a .pkl file using pickle.loads without verifying the trustworthiness of the data source. Because pickle deserialization can invoke the __reduce__ method of objects, an attacker-controlled pickle file can execute arbitrary code within the application context. This is classified as CWE-502 (Deserialization of Untrusted Data).
Potential Impact
Successful exploitation allows an attacker with the ability to supply a malicious pickle file to execute arbitrary code with the privileges of the application using the vulnerable function. This can lead to full compromise of the affected system, including confidentiality, integrity, and availability impacts.
Mitigation Recommendations
A fix is available in MONAI version 1.5.2 and later. Users should upgrade to version 1.5.2 or newer to remediate this vulnerability. Until upgraded, avoid invoking algo_from_pickle on untrusted or attacker-controlled pickle files.
MONAI before 1.5.2 contains a deserialization of untrusted data vulnerability in the algo_from_pickle function in monai/auto3dseg/utils.py. (CVE-2026-100846)
Description
MONAI versions prior to 1.5.2 contain a vulnerability in the algo_from_pickle function that allows deserialization of untrusted data. This function reads a .pkl file and directly passes its contents to pickle.loads without validating the source or content. An attacker supplying a crafted pickle file can trigger arbitrary code execution during deserialization.
CVSS v3.1
Score 7.6high
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in MONAI before version 1.5.2 exists in the algo_from_pickle function located in monai/auto3dseg/utils.py. This function deserializes data from a .pkl file using pickle.loads without verifying the trustworthiness of the data source. Because pickle deserialization can invoke the __reduce__ method of objects, an attacker-controlled pickle file can execute arbitrary code within the application context. This is classified as CWE-502 (Deserialization of Untrusted Data).
Potential Impact
Successful exploitation allows an attacker with the ability to supply a malicious pickle file to execute arbitrary code with the privileges of the application using the vulnerable function. This can lead to full compromise of the affected system, including confidentiality, integrity, and availability impacts.
Mitigation Recommendations
A fix is available in MONAI version 1.5.2 and later. Users should upgrade to version 1.5.2 or newer to remediate this vulnerability. Until upgraded, avoid invoking algo_from_pickle on untrusted or attacker-controlled pickle files.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-cvqf-4876-w239
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-100846"]
- Database Specific Severity
- HIGH
- Cvss Version
- 3.1
Threat ID: 6ab89bbdf7a7c54106941eb4
Added to database: 09/27/2026, 04:29:49 UTC
Last enriched: 09/27/2026, 04:35:36 UTC
Last updated: 09/27/2026, 07:07:48 UTC
Views: 2
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