gh-142787: Fix assertion failure in sqlite3 blob slice

python · erlend-aasland · Feb 26, 2026 · Dec 16, 2025 · Dec 16, 2025 · Dec 16, 2025
commit 97ca005b1d1eb360a796cb4bb238a57e96b2fc5d
diff --git a/Misc/NEWS.d/next/Library/2024-12-16-142787.gh-issue-142787.blob_slice.rst b/Misc/NEWS.d/next/Library/2024-12-16-142787.gh-issue-142787.blob_slice.rst
@@ -0,0 +1,2 @@
+Fix assertion failure in :mod:`sqlite3` blob subscript when slicing with
+indices that result in an empty slice.
@@ -439,6 +439,10 @@ subscript_slice(pysqlite_Blob *self, PyObject *item)
         return NULL;
     }
 
+    if (len == 0) {
+        return PyBytes_FromStringAndSize(NULL, 0);
+    }
+
     if (step == 1) {
         return read_multiple(self, len, start);
     }
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,2 @@
		Fix assertion failure in :mod:`sqlite3` blob subscript when slicing with
		indices that result in an empty slice.