From 9ee27526bc7c20e9487995253be4b0834894fe07 Mon Sep 17 00:00:00 2001
From: Shahar Naveh <50263213+ShaharNaveh@users.noreply.github.com>
Date: Tue, 12 May 2026 14:54:11 +0300
Subject: [PATCH] Update `encodings` to 3.14.5 (#7859)

---
 Lib/encodings/__init__.py |  5 +++++
 Lib/test/test_codecs.py   | 11 +++++++++++
 2 files changed, 16 insertions(+)

diff --git a/Lib/encodings/__init__.py b/Lib/encodings/__init__.py
index 298177eb8..8548bbe04 100644
--- a/Lib/encodings/__init__.py
+++ b/Lib/encodings/__init__.py
@@ -33,6 +33,7 @@ import sys
 from . import aliases
 
 _cache = {}
+_MAXCACHE = 500
 _unknown = '--unknown--'
 _import_tail = ['*']
 _aliases = aliases.aliases
@@ -115,6 +116,8 @@ def search_function(encoding):
 
     if mod is None:
         # Cache misses
+        if len(_cache) >= _MAXCACHE:
+            _cache.clear()
         _cache[encoding] = None
         return None
 
@@ -136,6 +139,8 @@ def search_function(encoding):
         entry = codecs.CodecInfo(*entry)
 
     # Cache the codec registry entry
+    if len(_cache) >= _MAXCACHE:
+        _cache.clear()
     _cache[encoding] = entry
 
     # Register its aliases (without overwriting previously registered
diff --git a/Lib/test/test_codecs.py b/Lib/test/test_codecs.py
index fefd062ea..58a7d6f3a 100644
--- a/Lib/test/test_codecs.py
+++ b/Lib/test/test_codecs.py
@@ -3921,5 +3921,16 @@ class CodecNameNormalizationTest(unittest.TestCase):
         self.assertEqual(normalize('utf...8'), 'utf...8')
 
 
+class CodecCacheTest(unittest.TestCase):
+    def test_cache_bounded(self):
+        for i in range(encodings._MAXCACHE + 1000):
+            try:
+                b'x'.decode(f'nonexist_{i}')
+            except LookupError:
+                pass
+
+        self.assertLessEqual(len(encodings._cache), encodings._MAXCACHE)
+
+
 if __name__ == "__main__":
     unittest.main()