Zoo Design Studio: Recursive KCL parsing is vulnerable to denial-of-service
Impact
Feeding a KCL program that wraps an expression in deep, unnecessary parentheses triggers the parser’s recursive expression -> unnecessarily_bracketed -> expression path. With enough nesting, the call stack grows until it exceeds the process stack limit, causing a stack overflow.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | zoo-kcl | < 0.3.129 | 0.3.129 |
References
- CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N- Weakness (CWE)
CWE-770- Platform
- Python (PyPI)
- Package
zoo-kcl- Disclosed
- 20.08.2026
- Updated
- 11.10.2026 15:17
Sources and licenses
OSV / GitHub Advisory Database - GHSA-jgvr-6x5w-hx5w - CC BY 4.0
Vulnerability history: zoo-kcl
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 2
- First → latest
- 08.2026 08.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Medium 2
Disclosures per year
- 2026: 2
-
Zoo Design Studio: Recursive KCL parsing is vulnerable to denial-of-service this entry
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