Project-MONAI up to 1.6.0 Scripts monai/bundle/scripts.py _get_fake_spatial_shape code injection

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Project-MONAI MONAI up to 1.6.0. This affects the function _get_fake_spatial_shape of the file monai/bundle/scripts.py of the component Scripts. Performing a manipulation results in code injection. This vulnerability is known as CVE-2026-100842. Attacking locally is a requirement. No exploit is available.

Detailsinfo

A vulnerability was found in Project-MONAI MONAI up to 1.6.0. It has been classified as problematic. This affects the function _get_fake_spatial_shape of the file monai/bundle/scripts.py of the component Scripts. The manipulation with an unknown input leads to a code injection vulnerability. CWE is classifying the issue as CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

MONAI through 1.6.0 contains an eval injection vulnerability in _get_fake_spatial_shape() in monai/bundle/scripts.py. The function validates shape expressions with a helper that walks the AST and only collects ast.Name nodes, rejecting any name other than 'p' or 'n', before passing the string to eval(). Expressions built solely from constants and attribute, subscript, or call nodes (for example "(1).__class__.__bases__[0].__subclasses__()" or "int.__class__.__init__.__globals__") contain no ast.Name nodes and therefore bypass the allowlist. Because the shape value originates from bundle metadata consumed by _get_real_input_data and verify_net_in_out (reachable through the bundle 'verify_net_in_out' CLI flow), an attacker who can influence a bundle's metadata can escape the eval sandbox via object introspection chains and achieve code execution in this non-default flow.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-100842 since 09/27/2026. The exploitability is told to be easy. Attacking locally is a requirement. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1059 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Project Management Software

Vendor

• Project-MONAI

Name

• MONAI

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6.0

Website

• Product: https://github.com/Project-MONAI/MONAI/

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