From f960d3eb65e06cd50e9a8632c3881026b0fa66c0 Mon Sep 17 00:00:00 2001
From: Justin Choquette <jchoquette@iol.unh.edu>
Date: Fri, 11 Jul 2025 13:05:56 -0400
Subject: [PATCH] Fix: is_uuid returns False for non-string inputs and catches
 exceptions thrown by UUID constructor

---
 jsonschema/_format.py | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/jsonschema/_format.py b/jsonschema/_format.py
index 9b4e67b6..318826ed 100644
--- a/jsonschema/_format.py
+++ b/jsonschema/_format.py
@@ -516,6 +516,9 @@ def is_duration(instance: object) -> bool:
 )
 def is_uuid(instance: object) -> bool:
     if not isinstance(instance, str):
-        return True
-    UUID(instance)
+        return False
+    try:
+        UUID(instance)
+    except:
+        return False
     return all(instance[position] == "-" for position in (8, 13, 18, 23))