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fix: disable regexp backtracking #160

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merged 1 commit into from
Nov 6, 2024
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fix: disable regexp backtracking #160

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6 changes: 4 additions & 2 deletions lib/util/escape.js
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Original file line number Diff line number Diff line change
Expand Up @@ -15,15 +15,17 @@ function escapeArgument(arg, doubleEscapeMetaChars) {
arg = `${arg}`;

// Algorithm below is based on https://qntm.org/cmd
// It's slightly altered to disable JS backtracking to avoid hanging on specially crafted input
// Please see https://github.com/moxystudio/node-cross-spawn/pull/160 for more information

// Sequence of backslashes followed by a double quote:
// double up all the backslashes and escape the double quote
arg = arg.replace(/(\\*)"/g, '$1$1\\"');
arg = arg.replace(/(?=\\*?)"/g, '$1$1\\"');

// Sequence of backslashes followed by the end of the string
// (which will become a double quote later):
// double up all the backslashes
arg = arg.replace(/(\\*)$/, '$1$1');
arg = arg.replace(/(?=\\*?)$/, '$1$1');

// All other backslashes occur literally

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