diff --git a/src/main/java/org/opensearch/security/securityconf/ConfigModelV7.java b/src/main/java/org/opensearch/security/securityconf/ConfigModelV7.java
index a30eda73ba..31bf626c7b 100644
--- a/src/main/java/org/opensearch/security/securityconf/ConfigModelV7.java
+++ b/src/main/java/org/opensearch/security/securityconf/ConfigModelV7.java
@@ -292,7 +292,10 @@ private Set<String> map(final User user, final TransportAddress caller) {
                 return Collections.emptySet();
             }
 
-            final Set<String> securityRoles = new HashSet<>(user.getSecurityRoles());
+            final Set<String> securityRoles = new HashSet<>();
+            synchronized (user.getSecurityRoles()) {
+                securityRoles.addAll(user.getSecurityRoles());
+            }
 
             if (rolesMappingResolution == ConfigConstants.RolesMappingResolution.BOTH
                 || rolesMappingResolution == ConfigConstants.RolesMappingResolution.BACKENDROLES_ONLY) {