diff --git a/Lib/importlib/_bootstrap_external.py b/Lib/importlib/_bootstrap_external.py
index 49bcaea78d7650..69261526eccb8a 100644
--- a/Lib/importlib/_bootstrap_external.py
+++ b/Lib/importlib/_bootstrap_external.py
@@ -1069,7 +1069,7 @@ def get_filename(self, fullname):
 
     def get_data(self, path):
         """Return the data from path as raw bytes."""
-        if isinstance(self, (SourceLoader, ExtensionFileLoader)):
+        if isinstance(self, (SourceLoader, SourcelessFileLoader, ExtensionFileLoader)):
             with _io.open_code(str(path)) as file:
                 return file.read()
         else:
diff --git a/Misc/NEWS.d/next/Security/2026-03-04-18-59-17.gh-issue-145506.6hwvEh.rst b/Misc/NEWS.d/next/Security/2026-03-04-18-59-17.gh-issue-145506.6hwvEh.rst
new file mode 100644
index 00000000000000..dcdb44d4fae4e5
--- /dev/null
+++ b/Misc/NEWS.d/next/Security/2026-03-04-18-59-17.gh-issue-145506.6hwvEh.rst
@@ -0,0 +1,2 @@
+Fixes :cve:`2026-2297` by ensuring that ``SourcelessFileLoader`` uses
+:func:`io.open_code` when opening ``.pyc`` files.