diff --git a/config/src/main/java/org/springframework/security/config/annotation/AbstractConfiguredSecurityBuilder.java b/config/src/main/java/org/springframework/security/config/annotation/AbstractConfiguredSecurityBuilder.java
index 04046fea10..42965a79fa 100644
--- a/config/src/main/java/org/springframework/security/config/annotation/AbstractConfiguredSecurityBuilder.java
+++ b/config/src/main/java/org/springframework/security/config/annotation/AbstractConfiguredSecurityBuilder.java
@@ -27,6 +27,7 @@
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 
+import org.jspecify.annotations.Nullable;
 import org.springframework.security.config.Customizer;
 import org.springframework.security.config.ObjectPostProcessor;
 import org.springframework.security.config.annotation.web.builders.WebSecurity;
@@ -181,6 +182,7 @@ public <C> void setSharedObject(Class<C> sharedType, C object) {
 	 * @param sharedType the type of the shared Object
 	 * @return the shared Object or null if it is not found
 	 */
+	@Nullable
 	@SuppressWarnings("unchecked")
 	public <C> C getSharedObject(Class<C> sharedType) {
 		return (C) this.sharedObjects.get(sharedType);