From b832e4c8934a173d24e435a8224895525b389ffc Mon Sep 17 00:00:00 2001
From: "google-labs-jules[bot]"
 <161369871+google-labs-jules[bot]@users.noreply.github.com>
Date: Sun, 1 Nov 2026 16:49:25 +0000
Subject: [PATCH] Fix command injection vulnerability in reconcile.ts

Co-authored-by: connerkup <72580335+connerkup@users.noreply.github.com>
---
 .jules/sentinel.md             | 4 ++++
 packages/core/src/reconcile.ts | 4 ++--
 2 files changed, 6 insertions(+), 2 deletions(-)
 create mode 100644 .jules/sentinel.md

diff --git a/.jules/sentinel.md b/.jules/sentinel.md
new file mode 100644
index 0000000..63d5461
--- /dev/null
+++ b/.jules/sentinel.md
@@ -0,0 +1,4 @@
+## 2024-05-14 - Fix command injection in Reconciler
+**Vulnerability:** A command injection vulnerability was present in the reconciler (`packages/core/src/reconcile.ts`). The `execSync` function was used to perform syntax checking on a temporary file path with string interpolation (`node --check "${tempFile}"`). While `tempFile` itself was relatively constrained, an attacker could potentially manipulate the workspace path to inject arbitrary shell commands.
+**Learning:** This codebase previously relied on `execSync` which invokes a shell interpreter, making it vulnerable to command injection if paths are not completely sanitized. Always avoid string-based command execution when user input or variable paths are involved. Furthermore, when refactoring to avoid shell usage, `execFileSync` is often a safer drop-in replacement than `spawnSync` because it preserves the exact Error object structure that existing `try...catch` blocks expect.
+**Prevention:** Replaced `execSync` with `execFileSync(process.execPath, ["--check", tempFile])` which avoids shell interpretation altogether by passing arguments as an array directly to the executable. Prefer `execFileSync` over `execSync` to prevent command injection while maintaining error handling compatibility.
diff --git a/packages/core/src/reconcile.ts b/packages/core/src/reconcile.ts
index b0285bc..7b04b7f 100644
--- a/packages/core/src/reconcile.ts
+++ b/packages/core/src/reconcile.ts
@@ -1,4 +1,4 @@
-import { execSync } from "node:child_process";
+import { execFileSync } from "node:child_process";
 import crypto from "node:crypto";
 import fs from "node:fs";
 import path from "node:path";
@@ -139,7 +139,7 @@ export function reconcile(options: ReconcileOptions): ReconcileResult {
   fs.writeFileSync(tempFile, extractedCode, "utf8");
 
   try {
-    execSync(`node --check "${tempFile}"`, { stdio: "pipe" });
+    execFileSync(process.execPath, ["--check", tempFile], { stdio: "pipe" });
     log.audit("Syntax check passed");
   } catch (err) {
     const stderr =