https://github.com/python/cpython/commit/9e262af9aebbad2abc975649036d6fc455bcb194
commit: 9e262af9aebbad2abc975649036d6fc455bcb194
branch: main
author: Jelle Zijlstra <[email protected]>
committer: JelleZijlstra <[email protected]>
date: 2026-10-19T19:30:21-07:00
summary:

gh-159739: Handle module filename encoding errors (#159749)

Propagate UTF-8 conversion errors before copying the module filename.

Co-authored-by: Jelle Zijlstra <[email protected]>

files:
A 
Misc/NEWS.d/next/Core_and_Builtins/2026-10-19-19-33-35.gh-issue-159739.09590b.rst
M Objects/moduleobject.c

diff --git 
a/Misc/NEWS.d/next/Core_and_Builtins/2026-10-19-19-33-35.gh-issue-159739.09590b.rst
 
b/Misc/NEWS.d/next/Core_and_Builtins/2026-10-19-19-33-35.gh-issue-159739.09590b.rst
new file mode 100644
index 00000000000000..3231be417aa80e
--- /dev/null
+++ 
b/Misc/NEWS.d/next/Core_and_Builtins/2026-10-19-19-33-35.gh-issue-159739.09590b.rst
@@ -0,0 +1 @@
+Avoid a crash when a module filename cannot be encoded as UTF-8.
diff --git a/Objects/moduleobject.c b/Objects/moduleobject.c
index 7a5d14c538391d..7c842f3ed8b196 100644
--- a/Objects/moduleobject.c
+++ b/Objects/moduleobject.c
@@ -992,6 +992,10 @@ _PyModule_GetFilenameUTF8(PyObject *mod, char *buffer, 
Py_ssize_t maxlen)
     }
     else {
         const char *filename = PyUnicode_AsUTF8AndSize(filenameobj, &size);
+        if (filename == NULL) {
+            Py_DECREF(filenameobj);
+            return -1;
+        }
         assert(size >= 0);
         if (size > maxlen) {
             size = -1;

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