fix: guard captured regex thread exceptions

Suresh Kumar Moharajan · Suresh Kumar Moharajan · commit 43c574ec26bc · 2026-04-14T15:23:47.000+01:00
Signed-off-by: Suresh Kumar Moharajan &lt;suresh.kumar.m@ibm.com&gt;
diff --git a/mcpgateway/services/content_security.py b/mcpgateway/services/content_security.py
@@ -343,8 +343,9 @@ def search_thread():
             )
             raise TimeoutError(f"Regex search exceeded {timeout}s timeout - possible ReDoS attack")
 
-        if exception[0]:
-            raise exception[0]
+        captured_exception = exception[0]
+        if captured_exception is not None:
+            raise captured_exception
 
         return result[0]
 

Original file line number	Diff line number	Diff line change
`@@ -343,8 +343,9 @@ def search_thread():`
`343`	`343`	`)`
`344`	`344`	`raise TimeoutError(f"Regex search exceeded {timeout}s timeout - possible ReDoS attack")`
`345`	`345`
`346`		`- if exception[0]:`
`347`		`- raise exception[0]`
	`346`	`+ captured_exception = exception[0]`
	`347`	`+ if captured_exception is not None:`
	`348`	`+ raise captured_exception`
`348`	`349`
`349`	`350`	`return result[0]`
`350`	`351`