Vulnerability Description
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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Project-Monai | Monai | <= 1.6.0 |
Related Weaknesses (CWE)
References
- https://github.com/Project-MONAI/MONAI/security/advisories/GHSA-h89g-r5pc-wxfmExploitMitigationVendor Advisory
- https://www.vulncheck.com/advisories/monai-through-1.6.0-get-fake-spatial-shape-Third Party Advisory
- https://github.com/Project-MONAI/MONAI/security/advisories/GHSA-h89g-r5pc-wxfmExploitMitigationVendor Advisory
FAQ
What is CVE-2026-100842?
CVE-2026-100842 is a vulnerability with a CVSS score of 7.0 (HIGH). 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...
How severe is CVE-2026-100842?
CVE-2026-100842 has been rated HIGH with a CVSS base score of 7.0/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-100842?
Check the references section above for vendor advisories and patch information. Affected products include: Project-Monai Monai.