diff --git a/UPGRADING b/UPGRADING
index ae0e3afc97ad..d332f75a4e61 100644
--- a/UPGRADING
+++ b/UPGRADING
@@ -19,6 +19,10 @@ PHP 8.6 UPGRADE NOTES
 1. Backward Incompatible Changes
 ========================================
 
+- COM
+  . It is no longer possible to clone variant objects, this is because
+    the cloning behaviour was ill defined.
+
 - DOM:
   . Properties previously documented as @readonly (e.g. DOMNode::$nodeType,
     DOMDocument::$xmlEncoding, DOMEntity::$actualEncoding, ::$encoding,
diff --git a/ext/com_dotnet/com_com.c b/ext/com_dotnet/com_com.c
index a0c8a955e0c5..63fc8f6563b2 100644
--- a/ext/com_dotnet/com_com.c
+++ b/ext/com_dotnet/com_com.c
@@ -17,8 +17,6 @@
 #endif
 
 #include "php.h"
-#include "php_ini.h"
-#include "ext/standard/info.h"
 #include "php_com_dotnet.h"
 #include "php_com_dotnet_internal.h"
 #include "Zend/zend_exceptions.h"
diff --git a/ext/com_dotnet/com_dotnet.c b/ext/com_dotnet/com_dotnet.c
index 78f420ff5591..d96aa0f1b120 100644
--- a/ext/com_dotnet/com_dotnet.c
+++ b/ext/com_dotnet/com_dotnet.c
@@ -16,11 +16,9 @@
 #include <config.h>
 #endif
 
-#include "php.h"
+# include "php.h"
 
 #ifdef HAVE_MSCOREE_H
-# include "php_ini.h"
-# include "ext/standard/info.h"
 # include "php_com_dotnet.h"
 # include "php_com_dotnet_internal.h"
 # include "Zend/zend_exceptions.h"
diff --git a/ext/com_dotnet/com_handlers.c b/ext/com_dotnet/com_handlers.c
index 81c42da34972..e4b187b3c98d 100644
--- a/ext/com_dotnet/com_handlers.c
+++ b/ext/com_dotnet/com_handlers.c
@@ -17,8 +17,6 @@
 #endif
 
 #include "php.h"
-#include "php_ini.h"
-#include "ext/standard/info.h"
 #include "php_com_dotnet.h"
 #include "php_com_dotnet_internal.h"
 #include "Zend/zend_exceptions.h"
@@ -511,7 +509,7 @@ zend_object_handlers php_com_object_handlers = {
 	0,
 	php_com_object_free_storage,
 	zend_objects_destroy_object,
-	php_com_object_clone,
+	NULL, /* clone */
 	NULL, /* clone_with */
 	com_property_read,
 	com_property_write,
@@ -589,30 +587,6 @@ void php_com_object_free_storage(zend_object *object)
 	zend_object_std_dtor(object);
 }
 
-zend_object* php_com_object_clone(zend_object *object)
-{
-	php_com_dotnet_object *cloneobj, *origobject;
-
-	origobject = (php_com_dotnet_object*) object;
-	cloneobj = (php_com_dotnet_object*)emalloc(sizeof(php_com_dotnet_object));
-
-	memcpy(cloneobj, origobject, sizeof(*cloneobj));
-
-	/* VariantCopy will perform VariantClear; we don't want to clobber
-	 * the IDispatch that we memcpy'd, so we init a new variant in the
-	 * clone structure */
-	VariantInit(&cloneobj->v);
-	/* We use the Indirection-following version of the API since we
-	 * want to clone as much as possible */
-	VariantCopyInd(&cloneobj->v, &origobject->v);
-
-	if (cloneobj->typeinfo) {
-		ITypeInfo_AddRef(cloneobj->typeinfo);
-	}
-
-	return (zend_object*)cloneobj;
-}
-
 zend_object* php_com_object_new(zend_class_entry *ce)
 {
 	php_com_dotnet_object *obj;
diff --git a/ext/com_dotnet/com_iterator.c b/ext/com_dotnet/com_iterator.c
index 796a31ac9be5..ee8f65c12c1a 100644
--- a/ext/com_dotnet/com_iterator.c
+++ b/ext/com_dotnet/com_iterator.c
@@ -17,8 +17,6 @@
 #endif
 
 #include "php.h"
-#include "php_ini.h"
-#include "ext/standard/info.h"
 #include "php_com_dotnet.h"
 #include "php_com_dotnet_internal.h"
 #include "Zend/zend_exceptions.h"
diff --git a/ext/com_dotnet/com_misc.c b/ext/com_dotnet/com_misc.c
index 47c670cd3588..2cca9f11ca3c 100644
--- a/ext/com_dotnet/com_misc.c
+++ b/ext/com_dotnet/com_misc.c
@@ -17,8 +17,6 @@
 #endif
 
 #include "php.h"
-#include "php_ini.h"
-#include "ext/standard/info.h"
 #include "php_com_dotnet.h"
 #include "php_com_dotnet_internal.h"
 #include "Zend/zend_exceptions.h"
diff --git a/ext/com_dotnet/com_olechar.c b/ext/com_dotnet/com_olechar.c
index 6270db6580f8..c4c7ca7a6a71 100644
--- a/ext/com_dotnet/com_olechar.c
+++ b/ext/com_dotnet/com_olechar.c
@@ -18,8 +18,6 @@
 #endif
 
 #include "php.h"
-#include "php_ini.h"
-#include "ext/standard/info.h"
 #include "php_com_dotnet.h"
 #include "php_com_dotnet_internal.h"
 
diff --git a/ext/com_dotnet/com_persist.c b/ext/com_dotnet/com_persist.c
index 5559567cbab3..916a8b05f139 100644
--- a/ext/com_dotnet/com_persist.c
+++ b/ext/com_dotnet/com_persist.c
@@ -25,8 +25,6 @@
 #endif
 
 #include "php.h"
-#include "php_ini.h"
-#include "ext/standard/info.h"
 #include "php_com_dotnet.h"
 #include "php_com_dotnet_internal.h"
 #include "Zend/zend_exceptions.h"
diff --git a/ext/com_dotnet/com_saproxy.c b/ext/com_dotnet/com_saproxy.c
index 0317c329589e..7cfdef4885f6 100644
--- a/ext/com_dotnet/com_saproxy.c
+++ b/ext/com_dotnet/com_saproxy.c
@@ -24,8 +24,6 @@
 #endif
 
 #include "php.h"
-#include "php_ini.h"
-#include "ext/standard/info.h"
 #include "php_com_dotnet.h"
 #include "php_com_dotnet_internal.h"
 #include "Zend/zend_exceptions.h"
diff --git a/ext/com_dotnet/com_typeinfo.c b/ext/com_dotnet/com_typeinfo.c
index ca20ed004d87..f80075c050ac 100644
--- a/ext/com_dotnet/com_typeinfo.c
+++ b/ext/com_dotnet/com_typeinfo.c
@@ -18,8 +18,6 @@
 #endif
 
 #include "php.h"
-#include "php_ini.h"
-#include "ext/standard/info.h"
 #include "php_com_dotnet.h"
 #include "php_com_dotnet_internal.h"
 
diff --git a/ext/com_dotnet/com_variant.c b/ext/com_dotnet/com_variant.c
index da3ccc64ffb3..82f17d12d9b5 100644
--- a/ext/com_dotnet/com_variant.c
+++ b/ext/com_dotnet/com_variant.c
@@ -17,8 +17,6 @@
 #endif
 
 #include "php.h"
-#include "php_ini.h"
-#include "ext/standard/info.h"
 #include "php_com_dotnet.h"
 #include "php_com_dotnet_internal.h"
 
diff --git a/ext/com_dotnet/com_wrapper.c b/ext/com_dotnet/com_wrapper.c
index c2297d18e58c..175a2de33074 100644
--- a/ext/com_dotnet/com_wrapper.c
+++ b/ext/com_dotnet/com_wrapper.c
@@ -20,8 +20,6 @@
 #endif
 
 #include "php.h"
-#include "php_ini.h"
-#include "ext/standard/info.h"
 #include "php_com_dotnet.h"
 #include "php_com_dotnet_internal.h"
 
diff --git a/ext/com_dotnet/php_com_dotnet_internal.h b/ext/com_dotnet/php_com_dotnet_internal.h
index 5aef37659c44..c7e065c24872 100644
--- a/ext/com_dotnet/php_com_dotnet_internal.h
+++ b/ext/com_dotnet/php_com_dotnet_internal.h
@@ -66,7 +66,6 @@ extern zend_class_entry *php_com_variant_class_entry, *php_com_exception_class_e
 
 /* com_handlers.c */
 zend_object* php_com_object_new(zend_class_entry *ce);
-zend_object* php_com_object_clone(zend_object *object);
 void php_com_object_free_storage(zend_object *object);
 extern zend_object_handlers php_com_object_handlers;
 void php_com_object_enable_event_sink(php_com_dotnet_object *obj, bool enable);
@@ -115,9 +114,11 @@ PHP_COM_DOTNET_API zend_result php_com_zval_from_variant(zval *z, VARIANT *v, in
 PHP_COM_DOTNET_API zend_result php_com_copy_variant(VARIANT *dst, VARIANT *src);
 
 /* com_dotnet.c */
+#ifdef HAVE_MSCOREE_H
 PHP_METHOD(dotnet, __construct);
 void php_com_dotnet_rshutdown(void);
 void php_com_dotnet_mshutdown(void);
+#endif
 
 /* com_misc.c */
 void php_com_throw_exception(HRESULT code, char *message);
diff --git a/ext/com_dotnet/tests/bug77177.phpt b/ext/com_dotnet/tests/bug77177.phpt
index 3395f4ed810d..cba12980ad97 100644
--- a/ext/com_dotnet/tests/bug77177.phpt
+++ b/ext/com_dotnet/tests/bug77177.phpt
@@ -2,16 +2,11 @@
 Bug #77177 (Serializing or unserializing COM objects crashes)
 --EXTENSIONS--
 com_dotnet
---SKIPIF--
-<?php
-if (!class_exists("dotnet")) die("skip mscoree not available");
-?>
 --FILE--
 <?php
 $com = new COM("WScript.Shell");
-$dotnet = new DOTNET("mscorlib", "System.Collections.Stack");
 $variant = new VARIANT;
-foreach ([$com, $dotnet, $variant] as $object) {
+foreach ([$com, $variant] as $object) {
     try {
         serialize($object);
     } catch (Exception $ex) {
@@ -19,7 +14,7 @@ foreach ([$com, $dotnet, $variant] as $object) {
     }
 }
 
-$strings = ['C:3:"com":0:{}', 'C:6:"dotnet":0:{}', 'C:7:"variant":0:{}'];
+$strings = ['C:3:"com":0:{}', 'C:7:"variant":0:{}'];
 foreach ($strings as $string) {
     try {
         unserialize($string);
@@ -28,7 +23,7 @@ foreach ($strings as $string) {
     }
 }
 
-$strings = ['O:3:"com":0:{}', 'O:6:"dotnet":0:{}', 'O:7:"variant":0:{}'];
+$strings = ['O:3:"com":0:{}', 'O:7:"variant":0:{}'];
 foreach ($strings as $string) {
     try {
         unserialize($string);
@@ -37,13 +32,10 @@ foreach ($strings as $string) {
     }
 }
 ?>
---EXPECTF--
+--EXPECT--
 Exception: Serialization of 'com' is not allowed
-Exception: Serialization of 'dotnet' is not allowed
 Exception: Serialization of 'variant' is not allowed
 Exception: Unserialization of 'com' is not allowed
-Exception: Unserialization of 'dotnet' is not allowed
 Exception: Unserialization of 'variant' is not allowed
 Exception: Unserialization of 'com' is not allowed
-Exception: Unserialization of 'dotnet' is not allowed
 Exception: Unserialization of 'variant' is not allowed
diff --git a/ext/com_dotnet/tests/bug77177_dotnet.phpt b/ext/com_dotnet/tests/bug77177_dotnet.phpt
new file mode 100644
index 000000000000..d80c180ae772
--- /dev/null
+++ b/ext/com_dotnet/tests/bug77177_dotnet.phpt
@@ -0,0 +1,33 @@
+--TEST--
+Bug #77177 (Serializing or unserializing COM objects crashes, dotnet class)
+--EXTENSIONS--
+com_dotnet
+--SKIPIF--
+<?php
+if (!class_exists("dotnet")) die("skip mscoree not available");
+?>
+--FILE--
+<?php
+$dotnet = new DOTNET("mscorlib", "System.Collections.Stack");
+try {
+    serialize($dotnet);
+} catch (Exception $ex) {
+    echo "Exception: {$ex->getMessage()}\n";
+}
+
+try {
+    unserialize('C:6:"dotnet":0:{}');
+} catch (Exception $ex) {
+    echo "Exception: {$ex->getMessage()}\n";
+}
+
+try {
+    unserialize('O:6:"dotnet":0:{}');
+} catch (Exception $ex) {
+    echo "Exception: {$ex->getMessage()}\n";
+}
+?>
+--EXPECT--
+Exception: Serialization of 'dotnet' is not allowed
+Exception: Unserialization of 'dotnet' is not allowed
+Exception: Unserialization of 'dotnet' is not allowed
diff --git a/ext/com_dotnet/tests/sa_proxy_errors.phpt b/ext/com_dotnet/tests/sa_proxy_errors.phpt
new file mode 100644
index 000000000000..99acb0c01521
--- /dev/null
+++ b/ext/com_dotnet/tests/sa_proxy_errors.phpt
@@ -0,0 +1,60 @@
+--TEST--
+com_safearray_proxy errors
+--EXTENSIONS--
+com_dotnet
+--FILE--
+<?php
+
+$binding_string = ['aaa','bbb','ccc'];
+$v = new VARIANT( $binding_string, VT_ARRAY );
+var_dump($v);
+
+try {
+    var_dump(isset($v->hello));
+} catch (Throwable $e) {
+    echo $e::class, ': ', $e->getMessage(), "\n";
+}
+
+try {
+    var_dump($v->hello);
+} catch (Throwable $e) {
+    echo $e::class, ': ', $e->getMessage(), "\n";
+}
+
+try {
+    $v->hello = 'blah';
+    var_dump($v);
+} catch (Throwable $e) {
+    echo $e::class, ': ', $e->getMessage(), "\n";
+}
+
+try {
+    unset($v->hello);
+    var_dump($v);
+} catch (Throwable $e) {
+    echo $e::class, ': ', $e->getMessage(), "\n";
+}
+
+try {
+    $c = clone $v;
+    var_dump($c);
+} catch (Throwable $e) {
+    echo $e::class, ': ', $e->getMessage(), "\n";
+}
+
+try {
+    $s = serialize($v);
+    var_dump($s);
+} catch (Throwable $e) {
+    echo $e::class, ': ', $e->getMessage(), "\n";
+}
+?>
+--EXPECT--
+object(variant)#1 (0) {
+}
+bool(false)
+com_exception: this variant has no properties
+com_exception: this variant has no properties
+Error: Cannot delete properties from a COM object
+Error: Trying to clone an uncloneable object of class variant
+Exception: Serialization of 'variant' is not allowed
diff --git a/ext/com_dotnet/tests/variant_no_clone.phpt b/ext/com_dotnet/tests/variant_no_clone.phpt
new file mode 100644
index 000000000000..93d49235ed4e
--- /dev/null
+++ b/ext/com_dotnet/tests/variant_no_clone.phpt
@@ -0,0 +1,19 @@
+--TEST--
+Prevent cloning of Variant types as it's broken
+--EXTENSIONS--
+com_dotnet
+--FILE--
+<?php
+
+$v = new variant("123");
+
+try {
+	$v2 = clone $v;
+    var_dump($v2);
+} catch (Throwable $e) {
+    echo $e::class, ': ', $e->getMessage(), "\n";
+}
+
+?>
+--EXPECT--
+Error: Trying to clone an uncloneable object of class variant