diff --git a/NEWS b/NEWS
index 9ef9d3c0731..5fc6756bb03 100644
--- a/NEWS
+++ b/NEWS
@@ -33,6 +33,12 @@ PHP                                                                        NEWS
 - SOAP:
   . Fixed bug GH-12392 (Segmentation fault on SoapClient::__getTypes).
     (nielsdos)
+  . Fixed bug #66150 (SOAP WSDL cache race condition causes Segmentation
+    Fault). (nielsdos)
+  . Fixed bug #67617 (SOAP leaves incomplete cache file on ENOSPC). (nielsdos)
+  . Fix incorrect uri check in SOAP caching. (nielsdos)
+  . Fix segfault and assertion failure with refcounted props and arrays.
+    (nielsdos)
 
 - XSL:
   . Add missing module dependency. (nielsdos)
diff --git a/ext/soap/php_encoding.c b/ext/soap/php_encoding.c
index 8d73a6cd277..db229648aba 100644
--- a/ext/soap/php_encoding.c
+++ b/ext/soap/php_encoding.c
@@ -1561,10 +1561,12 @@ static zval *to_zval_object_ex(zval *ret, encodeTypePtr type, xmlNodePtr data, z
 					if (Z_TYPE_P(prop) != IS_ARRAY) {
 						/* Convert into array */
 						array_init(&arr);
-						Z_ADDREF_P(prop);
+						Z_TRY_ADDREF_P(prop);
 						add_next_index_zval(&arr, prop);
 						set_zval_property(ret, (char*)trav->name, &arr);
 						prop = &arr;
+					} else {
+						SEPARATE_ARRAY(prop);
 					}
 					/* Add array element */
 					add_next_index_zval(prop, &tmpVal);
diff --git a/ext/soap/php_sdl.c b/ext/soap/php_sdl.c
index be42f9502d8..94b48199c84 100644
--- a/ext/soap/php_sdl.c
+++ b/ext/soap/php_sdl.c
@@ -22,6 +22,7 @@
 
 #include "ext/standard/md5.h"
 #include "zend_virtual_cwd.h"
+#include "main/php_open_temporary_file.h"
 
 #include <sys/types.h>
 #include <sys/stat.h>
@@ -1536,7 +1537,7 @@ static HashTable* sdl_deserialize_parameters(encodePtr *encoders, sdlTypePtr *ty
 	return ht;
 }
 
-static sdlPtr get_sdl_from_cache(const char *fn, const char *uri, time_t t, time_t *cached)
+static sdlPtr get_sdl_from_cache(const char *fn, const char *uri, size_t uri_len, time_t t, time_t *cached)
 {
 	sdlPtr sdl;
 	time_t old_t;
@@ -1583,7 +1584,7 @@ static sdlPtr get_sdl_from_cache(const char *fn, const char *uri, time_t t, time
 	*cached = old_t;
 
 	WSDL_CACHE_GET_INT(i, &in);
-	if (i == 0 && strncmp(in, uri, i) != 0) {
+	if (i != uri_len || strncmp(in, uri, i) != 0) {
 		unlink(fn);
 		efree(buf);
 		return NULL;
@@ -2119,7 +2120,10 @@ static void add_sdl_to_cache(const char *fn, const char *uri, time_t t, sdlPtr s
 	HashTable tmp_bindings;
 	HashTable tmp_functions;
 
-	f = open(fn,O_CREAT|O_WRONLY|O_EXCL|O_BINARY,S_IREAD|S_IWRITE);
+	/* To avoid race conditions, we first create a temporary file and then rename it atomically
+	 * at the end of the function. (see bug #66150) */
+	zend_string *temp_file_path;
+	f = php_open_temporary_fd_ex(SOAP_GLOBAL(cache_dir), "tmp.wsdl.", &temp_file_path, PHP_TMP_FILE_SILENT);
 
 	if (f < 0) {return;}
 
@@ -2371,13 +2375,21 @@ static void add_sdl_to_cache(const char *fn, const char *uri, time_t t, sdlPtr s
 		} ZEND_HASH_FOREACH_END();
 	}
 
-	php_ignore_value(write(f, ZSTR_VAL(buf.s), ZSTR_LEN(buf.s)));
+	bool valid_file = write(f, ZSTR_VAL(buf.s), ZSTR_LEN(buf.s)) == ZSTR_LEN(buf.s);
 	close(f);
+
+	/* Make sure that incomplete files (e.g. due to disk space issues, see bug #66150) are not utilised. */
+	if (valid_file) {
+		/* This is allowed to fail, this means that another process was raced to create the file. */
+		(void) VCWD_RENAME(ZSTR_VAL(temp_file_path), fn);
+	}
+
 	smart_str_free(&buf);
 	zend_hash_destroy(&tmp_functions);
 	zend_hash_destroy(&tmp_bindings);
 	zend_hash_destroy(&tmp_encoders);
 	zend_hash_destroy(&tmp_types);
+	zend_string_release_ex(temp_file_path, false);
 }
 
 
@@ -3232,7 +3244,7 @@ sdlPtr get_sdl(zval *this_ptr, char *uri, zend_long cache_wsdl)
 		}
 		memcpy(key+len,md5str,sizeof(md5str));
 
-		if ((sdl = get_sdl_from_cache(key, uri, t-SOAP_GLOBAL(cache_ttl), &cached)) != NULL) {
+		if ((sdl = get_sdl_from_cache(key, uri, uri_len, t-SOAP_GLOBAL(cache_ttl), &cached)) != NULL) {
 			t = cached;
 			efree(key);
 			goto cache_in_memory;
diff --git a/ext/soap/tests/bugs/segfault_assertion_props.phpt b/ext/soap/tests/bugs/segfault_assertion_props.phpt
new file mode 100644
index 00000000000..9d496d72967
--- /dev/null
+++ b/ext/soap/tests/bugs/segfault_assertion_props.phpt
@@ -0,0 +1,51 @@
+--TEST--
+Segfault and assertion failure with refcounted props and arrays
+--INI--
+soap.wsdl_cache_enabled=0
+--EXTENSIONS--
+soap
+--FILE--
+<?php
+class TestSoapClient extends SoapClient {
+  function __doRequest($request, $location, $action, $version, $one_way = false): ?string {
+        return <<<EOF
+<?xml version="1.0" encoding="UTF-8"?>
+<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ns1="http://schemas.nothing.com" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/" SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"><SOAP-ENV:Body>
+<ns1:dotest2Response><res xsi:type="SOAP-ENC:Struct">
+    <a xsi:type="xsd:string">Hello</a>
+    <b xsi:type="xsd:string">World</b>
+</res>
+</ns1:dotest2Response></SOAP-ENV:Body></SOAP-ENV:Envelope>
+EOF;
+    }
+}
+
+trait A {
+    public $a = [self::class . 'a'];
+    public $b = self::class . 'b';
+}
+
+class DummyClass {
+    use A;
+}
+
+$client = new TestSoapClient(__DIR__."/../classmap.wsdl", ['classmap' => ['Struct' => 'DummyClass']]);
+var_dump($client->dotest2("???"));
+?>
+--EXPECT--
+object(DummyClass)#2 (2) {
+  ["a"]=>
+  array(2) {
+    [0]=>
+    string(11) "DummyClassa"
+    [1]=>
+    string(5) "Hello"
+  }
+  ["b"]=>
+  array(2) {
+    [0]=>
+    string(11) "DummyClassb"
+    [1]=>
+    string(5) "World"
+  }
+}