From: Seth Michael Larson <seth@python.org>
Date: Tue, 3 Feb 2026 14:07:59 +0000 (-0600)
Subject: gh-74453: Add stronger security warning to os.path.commonprefix (GH-144401)
X-Git-Tag: v3.15.0a6~86
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=4e15b8d95da9a0f58ad58283979c37e43ff61229;p=thirdparty%2FPython%2Fcpython.git

gh-74453: Add stronger security warning to os.path.commonprefix (GH-144401)
---

diff --git a/Doc/library/os.path.rst b/Doc/library/os.path.rst
index 3cfe08a1fe1f..bfd59fc5a820 100644
--- a/Doc/library/os.path.rst
+++ b/Doc/library/os.path.rst
@@ -97,15 +97,17 @@ the :mod:`glob` module.)
 
 .. function:: commonprefix(list, /)
 
-   Return the longest path prefix (taken character-by-character) that is a
-   prefix of all paths in  *list*.  If *list* is empty, return the empty string
+   Return the longest string prefix (taken character-by-character) that is a
+   prefix of all strings in *list*.  If *list* is empty, return the empty string
    (``''``).
 
-   .. note::
+   .. warning::
 
       This function may return invalid paths because it works a
-      character at a time.  To obtain a valid path, see
-      :func:`commonpath`.
+      character at a time.
+      If you need a **common path prefix**, then the algorithm
+      implemented in this function is not secure. Use
+      :func:`commonpath` for finding a common path prefix.
 
       ::