diff --git a/pysnmp/proto/mpmod/rfc3412.py b/pysnmp/proto/mpmod/rfc3412.py
index 11c19606..5e2dd0e3 100644
--- a/pysnmp/proto/mpmod/rfc3412.py
+++ b/pysnmp/proto/mpmod/rfc3412.py
@@ -416,6 +416,9 @@ def prepare_response_message(
                 or pduType is not None
                 and pduType not in rfc3411.CONFIRMED_CLASS_PDUS
             ):
+                if securityModel in snmpEngine.security_models:
+                    smHandler = snmpEngine.security_models[securityModel]
+                    smHandler.release_state_information(securityStateReference)
                 raise error.StatusInformation(errorIndication=errind.loopTerminated)
 
             # 7.1.3c