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Fix Option for CVE-2024-4068: Memory Exhaustion in Braces #38

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Fix Option for CVE-2024-4068: Memory Exhaustion in Braces #38

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16 changes: 16 additions & 0 deletions lib/parse.js
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Original file line number Diff line number Diff line change
Expand Up @@ -39,6 +39,22 @@ const parse = (input, options = {}) => {
throw new SyntaxError(`Input length (${input.length}), exceeds max characters (${max})`);
}

let braceStack = [];
for (const char of input) {
if (char === '{') {
braceStack.push('{');
} else if (char === '}') {
if (braceStack.length === 0) {
throw new SyntaxError("Mismatched closing brace found");
}
braceStack.pop();
}
}

if (braceStack.length > 0) {
throw new SyntaxError("Mismatched open brace found");
}

let ast = { type: 'root', input, nodes: [] };
let stack = [ast];
let block = ast;
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