diff --git a/BUILD.gn b/BUILD.gn
index a01357c7ec8c263266dd2b3e08d753ab59315011..974ffd0618f08061b3097c7e94f432255f717a2e 100755
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -146,6 +146,7 @@ group("xml2") {
 }
 
 ohos_shared_library("libxml2") {
+  branch_protector_ret = "pac_ret"
   output_values = get_target_outputs(":libxml2_install_action")
   sources = filter_exclude(output_values,
                            [
diff --git a/Fix-CVE-2023-45322-pre-patch.patch b/Fix-CVE-2023-45322-pre-patch.patch
new file mode 100644
index 0000000000000000000000000000000000000000..e80a8eacafa4e5de1016a5f11ad6a1cb58ba246a
--- /dev/null
+++ b/Fix-CVE-2023-45322-pre-patch.patch
@@ -0,0 +1,45 @@
+From a22bd982bf10291deea8ba0c61bf75b898c604ce Mon Sep 17 00:00:00 2001
+From: Nick Wellnhofer <wellnhofer@aevum.de>
+Date: Wed, 2 Nov 2022 15:44:42 +0100
+Subject: [PATCH] malloc-fail: Fix memory leak in xmlStaticCopyNodeList
+
+Found with libFuzzer, see #344.
+---
+ tree.c | 7 +++++--
+ 1 file changed, 5 insertions(+), 2 deletions(-)
+
+diff --git a/tree.c b/tree.c
+index 507869efe..647288ce3 100644
+--- a/tree.c
++++ b/tree.c
+@@ -4380,7 +4380,7 @@ xmlStaticCopyNodeList(xmlNodePtr node, xmlDocPtr doc, xmlNodePtr parent) {
+ 	    }
+ 	    if (doc->intSubset == NULL) {
+ 		q = (xmlNodePtr) xmlCopyDtd( (xmlDtdPtr) node );
+-		if (q == NULL) return(NULL);
++		if (q == NULL) goto error;
+ 		q->doc = doc;
+ 		q->parent = parent;
+ 		doc->intSubset = (xmlDtdPtr) q;
+@@ -4392,7 +4392,7 @@ xmlStaticCopyNodeList(xmlNodePtr node, xmlDocPtr doc, xmlNodePtr parent) {
+ 	} else
+ #endif /* LIBXML_TREE_ENABLED */
+ 	    q = xmlStaticCopyNode(node, doc, parent, 1);
+-	if (q == NULL) return(NULL);
++	if (q == NULL) goto error;
+ 	if (ret == NULL) {
+ 	    q->prev = NULL;
+ 	    ret = p = q;
+@@ -4405,6 +4405,9 @@ xmlStaticCopyNodeList(xmlNodePtr node, xmlDocPtr doc, xmlNodePtr parent) {
+ 	node = node->next;
+     }
+     return(ret);
++error:
++    xmlFreeNodeList(ret);
++    return(NULL);
+ }
+ 
+ /**
+-- 
+GitLab
+
diff --git a/Fix-CVE-2023-45322.patch b/Fix-CVE-2023-45322.patch
new file mode 100644
index 0000000000000000000000000000000000000000..44cb26b4047869e7d26d426f275f13e4180c7b4f
--- /dev/null
+++ b/Fix-CVE-2023-45322.patch
@@ -0,0 +1,74 @@
+From d39f78069dff496ec865c73aa44d7110e429bce9 Mon Sep 17 00:00:00 2001
+From: Nick Wellnhofer <wellnhofer@aevum.de>
+Date: Wed, 23 Aug 2023 20:24:24 +0200
+Subject: [PATCH] tree: Fix copying of DTDs
+
+- Don't create multiple DTD nodes.
+- Fix UAF if malloc fails.
+- Skip DTD nodes if tree module is disabled.
+
+Fixes #583.
+---
+ tree.c | 31 ++++++++++++++++---------------
+ 1 file changed, 16 insertions(+), 15 deletions(-)
+
+diff --git a/tree.c b/tree.c
+index 6c8a875b9..02c1b5791 100644
+--- a/tree.c
++++ b/tree.c
+@@ -4370,29 +4370,28 @@ xmlNodePtr
+ xmlStaticCopyNodeList(xmlNodePtr node, xmlDocPtr doc, xmlNodePtr parent) {
+     xmlNodePtr ret = NULL;
+     xmlNodePtr p = NULL,q;
++    xmlDtdPtr newSubset = NULL;
+ 
+     while (node != NULL) {
+-#ifdef LIBXML_TREE_ENABLED
+ 	if (node->type == XML_DTD_NODE ) {
+-	    if (doc == NULL) {
++#ifdef LIBXML_TREE_ENABLED
++	    if ((doc == NULL) || (doc->intSubset != NULL)) {
+ 		node = node->next;
+ 		continue;
+ 	    }
+-	    if (doc->intSubset == NULL) {
+-		q = (xmlNodePtr) xmlCopyDtd( (xmlDtdPtr) node );
+-		if (q == NULL) goto error;
+-		q->doc = doc;
+-		q->parent = parent;
+-		doc->intSubset = (xmlDtdPtr) q;
+-		xmlAddChild(parent, q);
+-	    } else {
+-		q = (xmlNodePtr) doc->intSubset;
+-		xmlAddChild(parent, q);
+-	    }
+-	} else
++            q = (xmlNodePtr) xmlCopyDtd( (xmlDtdPtr) node );
++            if (q == NULL) goto error;
++            q->doc = doc;
++            q->parent = parent;
++            newSubset = (xmlDtdPtr) q;
++#else
++            node = node->next;
++            continue;
+ #endif /* LIBXML_TREE_ENABLED */
++	} else {
+ 	    q = xmlStaticCopyNode(node, doc, parent, 1);
+-	if (q == NULL) goto error;
++	    if (q == NULL) goto error;
++        }
+ 	if (ret == NULL) {
+ 	    q->prev = NULL;
+ 	    ret = p = q;
+@@ -4404,6 +4403,8 @@ xmlStaticCopyNodeList(xmlNodePtr node, xmlDocPtr doc, xmlNodePtr parent) {
+ 	}
+ 	node = node->next;
+     }
++    if (newSubset != NULL)
++        doc->intSubset = newSubset;
+     return(ret);
+ error:
+     xmlFreeNodeList(ret);
+-- 
+GitLab
+