GitHub Advisoryadvisory · PyPI, crates.io

GHSA-jgvr-6x5w-hx5w Zoo Design Studio: Recursive KCL parsing is vulnerable to denial-of-service

MEDIUM Published 2026-08-20 Modified 2026-08-20 Official page ↗
Ecosystem
PyPI, crates.io
Packages
zoo-kcl, kcl-lib
Severity
Moderate
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
Weaknesses
CWE-770
Reviewed
2026-08-20

Affected packages

• PyPI zoo-kcl: < 0.3.129 → fixed in 0.3.129 • crates.io kcl-lib: < 0.3.129 → fixed in 0.3.129

Description

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.

Related

Weakness · CWE (1)

  • CWE-770 Allocation of Resources Without Limits or Throttling weakness

References