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fix: reject control characters in PATH_TO_CLAUDE_CODE_EXECUTABLE #1161

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fix: reject control characters in PATH_TO_CLAUDE_CODE_EXECUTABLE #1161

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7 changes: 7 additions & 0 deletions src/entrypoints/run.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -49,6 +49,13 @@ async function installClaudeCode(): Promise<void> {
if (customExecutable) {
console.log(`Using custom Claude Code executable: ${customExecutable}`);
const claudeDir = dirname(customExecutable);
// Reject paths containing control characters — an embedded newline in claudeDir
// would inject an additional directory into GITHUB_PATH for all subsequent steps.
if (/[\x00-\x1f\x7f]/.test(claudeDir)) {
throw new Error(
`PATH_TO_CLAUDE_CODE_EXECUTABLE contains invalid control characters: ${JSON.stringify(claudeDir)}`,
);
}
// Add to PATH by appending to GITHUB_PATH
const githubPath = process.env.GITHUB_PATH;
if (githubPath) {
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