From 4d4c7e1c6930861f8388ce3cdd7a5335bf860e7d Mon Sep 17 00:00:00 2001
From: doe1080 <98906116+doe1080@users.noreply.github.com>
Date: Sun, 4 Jan 2026 05:53:16 +0900
Subject: [PATCH] [utils] `js_to_json`: Prevent false positives for octals
 (#15474)

Authored by: doe1080
---
 test/test_utils.py     | 3 +++
 yt_dlp/utils/_utils.py | 2 +-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/test/test_utils.py b/test/test_utils.py
index ce865511c6..0ee5c58fa8 100644
--- a/test/test_utils.py
+++ b/test/test_utils.py
@@ -1280,6 +1280,9 @@ class TestUtil(unittest.TestCase):
         on = js_to_json('[new Date("spam"), \'("eggs")\']')
         self.assertEqual(json.loads(on), ['spam', '("eggs")'], msg='Date regex should match a single string')
 
+        on = js_to_json('[0.077, 7.06, 29.064, 169.0072]')
+        self.assertEqual(json.loads(on), [0.077, 7.06, 29.064, 169.0072])
+
     def test_js_to_json_malformed(self):
         self.assertEqual(js_to_json('42a1'), '42"a1"')
         self.assertEqual(js_to_json('42a-1'), '42"a"-1')
diff --git a/yt_dlp/utils/_utils.py b/yt_dlp/utils/_utils.py
index 2ec697b100..695be84316 100644
--- a/yt_dlp/utils/_utils.py
+++ b/yt_dlp/utils/_utils.py
@@ -2830,7 +2830,7 @@ def js_to_json(code, vars={}, *, strict=False):
         {STRING_RE}|
         {COMMENT_RE}|,(?={SKIP_RE}[\]}}])|
         void\s0|(?:(?<![0-9])[eE]|[a-df-zA-DF-Z_$])[.a-zA-Z_$0-9]*|
-        \b(?:0[xX][0-9a-fA-F]+|0+[0-7]+)(?:{SKIP_RE}:)?|
+        \b(?:0[xX][0-9a-fA-F]+|(?<!\.)0+[0-7]+)(?:{SKIP_RE}:)?|
         [0-9]+(?={SKIP_RE}:)|
         !+
         ''', fix_kv, code)