pythongh-134070: Add news entry for mimalloc out-of-bounds fix

vedant713 · vedant713 · commit 64e971888fb4 · 2025-05-17T17:15:23.000-04:00
diff --git a/Misc/NEWS.d/next/Core_and_Builtins/2025-05-17-16-45-00.gh-issue-134070.vdhoke.rst b/Misc/NEWS.d/next/Core_and_Builtins/2025-05-17-16-45-00.gh-issue-134070.vdhoke.rst
@@ -0,0 +1,4 @@
+.. gh-issue: 134070
+.. section: Core and Builtins
+
+Fixed an out-of-bounds read in the generic implementation of `mi_clz32` and `mi_ctz32` in the integrated mimalloc allocator. This bug could occur on platforms with 64-bit `unsigned long` values. Based on upstream fix from microsoft/mimalloc.
