GHSA-m33r-qmcv-p97q: [soap] Fix use-after-free after header parsing failure with SOAP_PERSISTENCE_SESSION

Fixes GHSA-m33r-qmcv-p97q
Fixes CVE-2026-7261

Author: iluuu1994

ext/soap/soap.c

@@ -1438,12 +1438,20 @@ PHP_METHOD(SoapServer, handle)
 				    instanceof_function(Z_OBJCE(h->retval), soap_fault_class_entry)) {
 					php_output_discard();
 					soap_server_fault_ex(function, &h->retval, h);
-					if (service->type == SOAP_CLASS && soap_obj) {zval_ptr_dtor(soap_obj);}
+					if (service->type == SOAP_CLASS && soap_obj) {
+						if (service->soap_class.persistence != SOAP_PERSISTENCE_SESSION) {
+							zval_ptr_dtor(soap_obj);
+						}
+					}
 					goto fail;
 				} else if (EG(exception)) {
 					php_output_discard();
 					_soap_server_exception(service, function, ZEND_THIS);
-					if (service->type == SOAP_CLASS && soap_obj) {zval_ptr_dtor(soap_obj);}
+					if (service->type == SOAP_CLASS && soap_obj) {
+						if (service->soap_class.persistence != SOAP_PERSISTENCE_SESSION) {
+							zval_ptr_dtor(soap_obj);
+						}
+					}
 					goto fail;
 				}
 			} else if (h->mustUnderstand) {

ext/soap/tests/GHSA-m33r-qmcv-p97q.phpt

@@ -0,0 +1,58 @@
+--TEST--
+GHSA-m33r-qmcv-p97q: Use-after-free after header parsing failure with SOAP_PERSISTENCE_SESSION
+--CREDITS--
+Ilia Alshanetsky (iliaal)
+--EXTENSIONS--
+soap
+session
+--FILE--
+<?php
+
+class Handler {
+    public function return()  {
+        return new SoapFault('Server', 'denied');
+    }
+    public function throw()  {
+        throw new SoapFault('Server', 'denied');
+    }
+    public function hello() {
+        return 'ok';
+    }
+}
+
+session_start();
+
+$srv = new SoapServer(null, ['uri' => 'urn:a']);
+$srv->setClass(Handler::class);
+$srv->setPersistence(SOAP_PERSISTENCE_SESSION);
+
+$srv->handle(<<<XML
+<?xml version="1.0" encoding="UTF-8"?>
+<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:a="urn:a">
+    <soap:Header>
+        <a:return/>
+    </soap:Header>
+    <soap:Body>
+        <a:hello/>
+    </soap:Body>
+</soap:Envelope>
+XML);
+
+$srv->handle(<<<XML
+<?xml version="1.0" encoding="UTF-8"?>
+<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:a="urn:a">
+    <soap:Header>
+        <a:throw/>
+    </soap:Header>
+    <soap:Body>
+        <a:hello/>
+    </soap:Body>
+</soap:Envelope>
+XML);
+
+?>
+--EXPECT--
+<?xml version="1.0" encoding="UTF-8"?>
+<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"><SOAP-ENV:Body><SOAP-ENV:Fault><faultcode>SOAP-ENV:Server</faultcode><faultstring>denied</faultstring></SOAP-ENV:Fault></SOAP-ENV:Body></SOAP-ENV:Envelope>
+<?xml version="1.0" encoding="UTF-8"?>
+<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"><SOAP-ENV:Body><SOAP-ENV:Fault><faultcode>SOAP-ENV:Server</faultcode><faultstring>denied</faultstring></SOAP-ENV:Fault></SOAP-ENV:Body></SOAP-ENV:Envelope>