diff --git a/src/ClientRequestContext.h b/src/ClientRequestContext.h
index 55a7a43..94a8700 100644
--- a/src/ClientRequestContext.h
+++ b/src/ClientRequestContext.h
@@ -80,6 +80,10 @@ public:
 #endif
     ErrorState *error; ///< saved error page for centralized/delayed processing
     bool readNextRequest; ///< whether Squid should read after error handling
+
+#if FOLLOW_X_FORWARDED_FOR
+    size_t currentXffHopNumber = 0; ///< number of X-Forwarded-For header values processed so far
+#endif
 };
 
 #endif /* SQUID_CLIENTREQUESTCONTEXT_H */
diff --git a/src/client_side_request.cc b/src/client_side_request.cc
index f44849e..c7c09d4 100644
--- a/src/client_side_request.cc
+++ b/src/client_side_request.cc
@@ -80,6 +80,11 @@
 static const char *const crlf = "\r\n";
 
 #if FOLLOW_X_FORWARDED_FOR
+
+#if !defined(SQUID_X_FORWARDED_FOR_HOP_MAX)
+#define SQUID_X_FORWARDED_FOR_HOP_MAX 64
+#endif
+
 static void clientFollowXForwardedForCheck(Acl::Answer answer, void *data);
 #endif /* FOLLOW_X_FORWARDED_FOR */
 
@@ -485,8 +490,16 @@ clientFollowXForwardedForCheck(Acl::Answer answer, void *data)
                 /* override the default src_addr tested if we have to go deeper than one level into XFF */
                 Filled(calloutContext->acl_checklist)->src_addr = request->indirect_client_addr;
             }
-            calloutContext->acl_checklist->nonBlockingCheck(clientFollowXForwardedForCheck, data);
-            return;
+            if (++calloutContext->currentXffHopNumber < SQUID_X_FORWARDED_FOR_HOP_MAX) {
+                calloutContext->acl_checklist->nonBlockingCheck(clientFollowXForwardedForCheck, data);
+                return;
+            }
+            const auto headerName = Http::HeaderLookupTable.lookup(Http::HdrType::X_FORWARDED_FOR).name;
+            debugs(28, DBG_CRITICAL, "ERROR: Ignoring trailing " << headerName << " addresses" <<
+                   Debug::Extra << "addresses allowed by follow_x_forwarded_for: " << calloutContext->currentXffHopNumber <<
+                   Debug::Extra << "last/accepted address: " << request->indirect_client_addr <<
+                   Debug::Extra << "ignored trailing addresses: " << request->x_forwarded_for_iterator);
+            // fall through to resume clientAccessCheck() processing
         }
     }