From a962211f9e365fb4e1ce0e0e11c68677f13b9594 Mon Sep 17 00:00:00 2001
From: Yuwei Zhao <zhaoyuweiteddy@163.com>
Date: Sun, 2 Aug 2026 23:46:27 +0800
Subject: [PATCH] Avoid cached split lookup for single blueprint names

---
 src/flask/wrappers.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/flask/wrappers.py b/src/flask/wrappers.py
index bab610291c..88c6c6ad9f 100644
--- a/src/flask/wrappers.py
+++ b/src/flask/wrappers.py
@@ -192,6 +192,9 @@ def blueprints(self) -> list[str]:
         if name is None:
             return []
 
+        if "." not in name:
+            return [name]
+
         return _split_blueprint_path(name)
 
     def _load_form_data(self) -> None: