File php7-CVE-2026-91765.patch of Package php7

From 3655b79c7bfa90db004d75a3b282ed0f538f4836 Mon Sep 17 00:00:00 2001
From: Alexandre Daubois <alex.daubois@gmail.com>
Date: Thu, 17 Sep 2026 08:09:08 +0200
Subject: [PATCH] Fix GHSA-rgrp-mwpx-f6rm: unbounded recursion in ext/soap XML
 parsing and decoding

---
 ext/soap/php_encoding.c                       |   7 ++
 ext/soap/php_soap.h                           |   3 +
 ext/soap/php_xml.c                            | 102 ++++++++++++++----
 ext/soap/soap.c                               |   1 +
 .../tests/GHSA-rgrp-mwpx-f6rm-href-chain.phpt |  47 ++++++++
 .../tests/GHSA-rgrp-mwpx-f6rm-href-cycle.phpt |  43 ++++++++
 ext/soap/tests/GHSA-rgrp-mwpx-f6rm.phpt       |  89 +++++++++++++++
 7 files changed, 272 insertions(+), 20 deletions(-)
 create mode 100644 ext/soap/tests/GHSA-rgrp-mwpx-f6rm-href-chain.phpt
 create mode 100644 ext/soap/tests/GHSA-rgrp-mwpx-f6rm-href-cycle.phpt
 create mode 100644 ext/soap/tests/GHSA-rgrp-mwpx-f6rm.phpt

Index: php-7.4.33/ext/soap/php_encoding.c
===================================================================
--- php-7.4.33.orig/ext/soap/php_encoding.c
+++ php-7.4.33/ext/soap/php_encoding.c
@@ -558,7 +558,12 @@ static zval *master_to_zval_int(zval *re
 		}
 	}
 	if (encode->to_zval) {
+		if (SOAP_GLOBAL(decode_depth) >= SOAP_MAX_DECODE_DEPTH) {
+			soap_error0(E_ERROR, "Encoding: Nesting level too deep");
+		}
+		SOAP_GLOBAL(decode_depth)++;
 		ret = encode->to_zval(ret, &encode->details, data);
+		SOAP_GLOBAL(decode_depth)--;
 	}
 	return ret;
 }
@@ -3424,6 +3429,7 @@ void encode_reset_ns()
 {
 	SOAP_GLOBAL(cur_uniq_ns) = 0;
 	SOAP_GLOBAL(cur_uniq_ref) = 0;
+	SOAP_GLOBAL(decode_depth) = 0;
 	if (SOAP_GLOBAL(ref_map)) {
 		zend_hash_destroy(SOAP_GLOBAL(ref_map));
 	} else {
@@ -3436,6 +3442,7 @@ void encode_finish()
 {
 	SOAP_GLOBAL(cur_uniq_ns) = 0;
 	SOAP_GLOBAL(cur_uniq_ref) = 0;
+	SOAP_GLOBAL(decode_depth) = 0;
 	if (SOAP_GLOBAL(ref_map)) {
 		zend_hash_destroy(SOAP_GLOBAL(ref_map));
 		efree(SOAP_GLOBAL(ref_map));
Index: php-7.4.33/ext/soap/php_soap.h
===================================================================
--- php-7.4.33.orig/ext/soap/php_soap.h
+++ php-7.4.33/ext/soap/php_soap.h
@@ -152,6 +152,8 @@ struct _soapService {
 #define SOAP_SSL_METHOD_SSLv3   2
 #define SOAP_SSL_METHOD_SSLv23  3
 
+#define SOAP_MAX_XML_DEPTH 2048
+#define SOAP_MAX_DECODE_DEPTH (SOAP_MAX_XML_DEPTH * 2)
 
 ZEND_BEGIN_MODULE_GLOBALS(soap)
 	HashTable  defEncNs;     /* mapping of default namespaces to prefixes */
@@ -177,6 +179,7 @@ ZEND_BEGIN_MODULE_GLOBALS(soap)
 	HashTable  wsdl_cache;
 	int        cur_uniq_ref;
 	HashTable *ref_map;
+	unsigned int decode_depth;
 ZEND_END_MODULE_GLOBALS(soap)
 
 #ifdef ZTS
Index: php-7.4.33/ext/soap/php_xml.c
===================================================================
--- php-7.4.33.orig/ext/soap/php_xml.c
+++ php-7.4.33/ext/soap/php_xml.c
@@ -37,36 +37,72 @@ static int is_blank(const xmlChar* str)
 	return 1;
 }
 
-/* removes all empty text, comments and other insignoficant nodes */
+/* removes all empty text, comments and other insignoficant nodes.
+ * Iterative because recursion overflows the stack on a deep document. */
 static void cleanup_xml_node(xmlNodePtr node)
 {
-	xmlNodePtr trav;
-	xmlNodePtr del = NULL;
+	xmlNodePtr parent = node;
+	xmlNodePtr trav = node->children;
 
-	trav = node->children;
 	while (trav != NULL) {
-		if (del != NULL) {
-			xmlUnlinkNode(del);
-			xmlFreeNode(del);
-			del = NULL;
-		}
+		xmlNodePtr next = trav->next;
+
 		if (trav->type == XML_TEXT_NODE) {
 			if (is_blank(trav->content)) {
-				del = trav;
+				xmlUnlinkNode(trav);
+				xmlFreeNode(trav);
 			}
 		} else if ((trav->type != XML_ELEMENT_NODE) &&
 		           (trav->type != XML_CDATA_SECTION_NODE)) {
-			del = trav;
+			xmlUnlinkNode(trav);
+			xmlFreeNode(trav);
 		} else if (trav->children != NULL) {
-			cleanup_xml_node(trav);
+			parent = trav;
+			trav = trav->children;
+			continue;
 		}
-		trav = trav->next;
+
+		while (next == NULL) {
+			if (parent == node) {
+				return;
+			}
+			next = parent->next;
+			parent = parent->parent;
+		}
+		trav = next;
 	}
-	if (del != NULL) {
-		xmlUnlinkNode(del);
-		xmlFreeNode(del);
+}
+
+#if LIBXML_VERSION < 21300
+static int is_nesting_too_deep(xmlNodePtr node)
+{
+	xmlNodePtr trav = node->children;
+	unsigned int depth = 0;
+
+	while (trav != NULL) {
+		/* An entity reference borrows its declaration as child list, and that
+		 * declaration hangs off the DTD, so descending leaves the document. */
+		if (trav->children != NULL &&
+		    trav->type != XML_ENTITY_REF_NODE &&
+		    trav->type != XML_DTD_NODE) {
+			if (++depth > SOAP_MAX_XML_DEPTH) {
+				return TRUE;
+			}
+			trav = trav->children;
+			continue;
+		}
+		while (trav->next == NULL) {
+			trav = trav->parent;
+			if (trav == node) {
+				return FALSE;
+			}
+			depth--;
+		}
+		trav = trav->next;
 	}
+	return FALSE;
 }
+#endif
 
 static void soap_ignorableWhitespace(void *ctx, const xmlChar *ch, int len)
 {
@@ -124,6 +160,15 @@ xmlDocPtr soap_xmlParseFile(const char *
 */
 
 	if (ret) {
+#if LIBXML_VERSION < 21300
+		if (is_nesting_too_deep((xmlNodePtr)ret)) {
+			/* php_sdl.c reports xmlGetLastError() as the reason, and libxml2 did
+			 * not fail here, so drop the error an earlier parse left behind. */
+			xmlResetLastError();
+			xmlFreeDoc(ret);
+			return NULL;
+		}
+#endif
 		cleanup_xml_node((xmlNodePtr)ret);
 	}
 	return ret;
@@ -171,6 +216,13 @@ xmlDocPtr soap_xmlParseMemory(const void
 	xmlCleanupParser();
 */
 
+#if LIBXML_VERSION < 21300
+	if (ret && is_nesting_too_deep((xmlNodePtr)ret)) {
+		xmlFreeDoc(ret);
+		ret = NULL;
+	}
+#endif
+
 /*
 	if (ret) {
 		cleanup_xml_node((xmlNodePtr)ret);
@@ -293,6 +345,8 @@ xmlNodePtr get_node_with_attribute_ex(xm
 
 xmlNodePtr get_node_with_attribute_recursive_ex(xmlNodePtr node, char *name, char *name_ns, char *attribute, char *value, char *attr_ns)
 {
+	unsigned int depth = 0;
+
 	while (node != NULL) {
 		if (node_is_equal_ex(node, name, name_ns)) {
 			xmlAttrPtr attr = get_attribute_ex(node->properties, attribute, attr_ns);
@@ -300,11 +354,19 @@ xmlNodePtr get_node_with_attribute_recur
 				return node;
 			}
 		}
-		if (node->children != NULL) {
-			xmlNodePtr tmp = get_node_with_attribute_recursive_ex(node->children, name, name_ns, attribute, value, attr_ns);
-			if (tmp) {
-				return tmp;
+		if (node->children != NULL &&
+		    node->type != XML_ENTITY_REF_NODE &&
+		    node->type != XML_DTD_NODE) {
+			node = node->children;
+			depth++;
+			continue;
+		}
+		while (node->next == NULL) {
+			if (depth == 0) {
+				return NULL;
 			}
+			node = node->parent;
+			depth--;
 		}
 		node = node->next;
 	}
Index: php-7.4.33/ext/soap/soap.c
===================================================================
--- php-7.4.33.orig/ext/soap/soap.c
+++ php-7.4.33/ext/soap/soap.c
@@ -579,6 +579,7 @@ static void php_soap_init_globals(zend_s
 	soap_globals->soap_version = SOAP_1_1;
 	soap_globals->mem_cache = NULL;
 	soap_globals->ref_map = NULL;
+	soap_globals->decode_depth = 0;
 }
 
 PHP_MSHUTDOWN_FUNCTION(soap)