From 08ee45b4c4146ee0a17466e6cb0f770d362ea6d2 Mon Sep 17 00:00:00 2001
From: "google-labs-jules[bot]"
 <161369871+google-labs-jules[bot]@users.noreply.github.com>
Date: Mon, 11 May 2026 10:12:20 +0000
Subject: [PATCH] =?UTF-8?q?=F0=9F=9B=A1=EF=B8=8F=20Sentinel:=20[CRITICAL]?=
 =?UTF-8?q?=20Fix=20Path=20Traversal=20in=20ApiFilesGet?=
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Co-authored-by: thirdeyenation <133812267+thirdeyenation@users.noreply.github.com>
---
 .jules/sentinel.md   | 4 ++++
 api/api_files_get.py | 5 +++++
 2 files changed, 9 insertions(+)
 create mode 100644 .jules/sentinel.md

diff --git a/.jules/sentinel.md b/.jules/sentinel.md
new file mode 100644
index 0000000000..bfe964669d
--- /dev/null
+++ b/.jules/sentinel.md
@@ -0,0 +1,4 @@
+## 2024-10-24 - Fix Path Traversal in ApiFilesGet
+ **Vulnerability:** Path traversal in `api/api_files_get.py` allowed arbitrary file reading outside of the base directory via manipulated input paths (e.g. starting with `/a0/../../`).
+ **Learning:** When converting internal virtual paths to physical paths on the file system, standard normalization handles `..` but can resolve to directories completely outside the expected application root.
+ **Prevention:** Always use a base directory check function (like `files.is_in_base_dir()`) immediately before acting on any user-provided or user-manipulated file path to restrict access boundaries.
diff --git a/api/api_files_get.py b/api/api_files_get.py
index b2533f4f4f..0df7900719 100644
--- a/api/api_files_get.py
+++ b/api/api_files_get.py
@@ -62,6 +62,11 @@ async def process(self, input: dict, request: Request) -> dict | Response:
                         external_path = path
                         filename = os.path.basename(path)
 
+                    # Security check: ensure path is within base directory to prevent path traversal
+                    if not files.is_in_base_dir(external_path):
+                        PrintStyle.warning(f"Security: Path traversal attempt blocked for path: {path}")
+                        continue
+
                     # Check if file exists
                     if not os.path.exists(external_path):
                         PrintStyle.warning(f"File not found: {path}")