diff --git a/autotests/plugins/cliunarchiverplugin/CMakeLists.txt b/autotests/plugins/cliunarchiverplugin/CMakeLists.txt
--- a/autotests/plugins/cliunarchiverplugin/CMakeLists.txt
+++ b/autotests/plugins/cliunarchiverplugin/CMakeLists.txt
@@ -12,3 +12,6 @@
     LINK_LIBRARIES testhelper kerfuffle Qt5::Test
     TEST_NAME cliunarchivertest
     NAME_PREFIX plugins-)
+
+# cliunarchiver plugin needs exceptions enabled
+kde_target_enable_exceptions(cliunarchivertest PRIVATE)
diff --git a/plugins/cliunarchiverplugin/CMakeLists.txt b/plugins/cliunarchiverplugin/CMakeLists.txt
--- a/plugins/cliunarchiverplugin/CMakeLists.txt
+++ b/plugins/cliunarchiverplugin/CMakeLists.txt
@@ -22,6 +22,9 @@
 
 kerfuffle_add_plugin(kerfuffle_cliunarchiver ${kerfuffle_cliunarchiver_SRCS})
 
+# This plugin has a catch() block
+kde_target_enable_exceptions(kerfuffle_cliunarchiver PRIVATE)
+
 set(SUPPORTED_ARK_MIMETYPES "${SUPPORTED_ARK_MIMETYPES}${SUPPORTED_CLIUNARCHIVER_MIMETYPES}"
 PARENT_SCOPE)
 set(INSTALLED_KERFUFFLE_PLUGINS "${INSTALLED_KERFUFFLE_PLUGINS}kerfuffle_cliunarchiver;" PARENT_SCOPE)
diff --git a/plugins/cliunarchiverplugin/cliplugin.cpp b/plugins/cliunarchiverplugin/cliplugin.cpp
--- a/plugins/cliunarchiverplugin/cliplugin.cpp
+++ b/plugins/cliunarchiverplugin/cliplugin.cpp
@@ -138,7 +138,15 @@
 {
     // Collect the json output line by line.
     if (m_operationMode == List) {
-        m_jsonOutput += line + QLatin1Char('\n');
+        // #372210: lsar can generate huge JSONs for big archives.
+        // We can at least catch a bad_alloc here in order to not crash.
+        try {
+            m_jsonOutput += line + QLatin1Char('\n');
+        } catch (const std::bad_alloc&) {
+            m_jsonOutput.clear();
+            emit error(i18n("Not enough memory for loading the archive."));
+            return false;
+        }
     }
 
     if (m_operationMode == List) {