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MONAI EUVDEUVD-2026-87845

| CVE-2026-100843 HIGH
Deserialization of Untrusted Data (CWE-502)
2026-09-27 VulnCheck GHSA-m8hq-fmc4-c3v2
8.5
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
8.5 HIGH
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
7.8 HIGH

Attacker supplies a malicious file needing no privileges (PR:N) but a victim must load it locally, so AV:L and UI:R; unrestricted pickle yields full code execution (C/I/A:H).

3.1 AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
4.0 AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
P
Scope
X

Lifecycle Timeline

5
POC Analysis Generated
Sep 27, 2026 - 11:24 vuln.today
Patch available
Sep 27, 2026 - 03:16 EUVD
Metadata Corrected
Sep 27, 2026 - 02:40 vuln.today
tag: Python added
Analysis Generated
Sep 27, 2026 - 02:23 vuln.today
CVE Published
Sep 27, 2026 - 01:28 cve.org
HIGH 8.5

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 1 pypi packages depend on monai (1 direct, 0 indirect)

Ecosystem-wide dependent count for version 1.6.0.

DescriptionCVE.org

MONAI versions before 1.6.0 contain a remote code execution vulnerability in the algo_from_pickle() function due to unsafe pickle.loads() deserialization in monai/auto3dseg/utils.py. Attackers can craft malicious pickle files that execute arbitrary system commands when deserialized by the vulnerable function.

AnalysisAI

Deserialization of attacker-controlled pickle data in MONAI's Auto3DSeg module (monai/auto3dseg/utils.py) lets code run inside any process that calls algo_from_pickle() on a file the attacker can supply or substitute, with full read/write/execute impact on that process and its data. Versions before 1.6.0 are affected (pip package monai < 1.6.0, CPE cpe:2.3:a:project-monai:monai); the vulnerable pickle.loads() at line 321 fires before any isinstance or key checks, so no special configuration flag is needed to reach the sink. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Delivery
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Exploit
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Execution
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Impact
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Vulnerability AssessmentAI

Exploitation Exploitation requires that a MONAI application or Auto3DSeg pipeline call algo_from_pickle() (in monai/auto3dseg/utils.py) with a file path the attacker can control or substitute - typically via exchange of algorithm bundles or model checkpoints. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment This is a genuine but conditionally-gated deserialization RCE (CWE-502). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade to MONAI 1.6.0 or later (for example pip install --upgrade 'monai>=1.6.0'), which is the release containing the actual fix for the unsafe pickle.loads() calls in monai/auto3dseg/utils.py; do not treat v1.5.2 as remediated, because GHSA-89gg-p5r5-q6r4's claimed patch was never implemented and 1.5.2 remains exploitable. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours, identify all systems running MONAI versions before 1.6.0 (pip package monai < 1.6.0) and inventory any use of the Auto3DSeg module's algo_from_pickle() function. …

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EUVD-2026-87845 vulnerability details – vuln.today

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