[Python-checkins] [3.9] bpo-46474: Avoid REDoS in EntryPoint.pattern (sync with importlib_metadata 4.10.1) (GH-30803). (GH-30828)

jaraco webhook-mailer at python.org
Sun Jan 23 10:17:46 EST 2022


https://github.com/python/cpython/commit/1514d1252f96e6a83eb65c439522a6b5443f6a1a
commit: 1514d1252f96e6a83eb65c439522a6b5443f6a1a
branch: 3.9
author: Jason R. Coombs <jaraco at jaraco.com>
committer: jaraco <jaraco at jaraco.com>
date: 2022-01-23T10:17:41-05:00
summary:

[3.9] bpo-46474: Avoid REDoS in EntryPoint.pattern (sync with importlib_metadata 4.10.1) (GH-30803). (GH-30828)

(cherry picked from commit 51c3e28c8a163e58dc753765e3cc51d5a717e70d)

Co-authored-by: Jason R. Coombs <jaraco at jaraco.com>

files:
A Misc/NEWS.d/next/Library/2022-01-22-14-49-10.bpo-46474.eKQhvx.rst
M Lib/importlib/metadata.py

diff --git a/Lib/importlib/metadata.py b/Lib/importlib/metadata.py
index 594986ce23efa..7b8038fd63a84 100644
--- a/Lib/importlib/metadata.py
+++ b/Lib/importlib/metadata.py
@@ -49,8 +49,8 @@ class EntryPoint(
 
     pattern = re.compile(
         r'(?P<module>[\w.]+)\s*'
-        r'(:\s*(?P<attr>[\w.]+))?\s*'
-        r'(?P<extras>\[.*\])?\s*$'
+        r'(:\s*(?P<attr>[\w.]+)\s*)?'
+        r'((?P<extras>\[.*\])\s*)?$'
         )
     """
     A regular expression describing the syntax for an entry point,
diff --git a/Misc/NEWS.d/next/Library/2022-01-22-14-49-10.bpo-46474.eKQhvx.rst b/Misc/NEWS.d/next/Library/2022-01-22-14-49-10.bpo-46474.eKQhvx.rst
new file mode 100644
index 0000000000000..156b7de4f6787
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2022-01-22-14-49-10.bpo-46474.eKQhvx.rst
@@ -0,0 +1,2 @@
+In ``importlib.metadata.EntryPoint.pattern``, avoid potential REDoS by
+limiting ambiguity in consecutive whitespace.



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