diff --git a/CVE-2021-29946.patch b/CVE-2021-29946.patch
new file mode 100644
index 0000000000000000000000000000000000000000..4d48539a77a57b852775502d746215223b4111cb
--- /dev/null
+++ b/CVE-2021-29946.patch
@@ -0,0 +1,94 @@
+From e8f9f3b8869e7cd0db4f84d05ebb42c1ccd06395 Mon Sep 17 00:00:00 2001
+From: Frederik Braun <fbraun@mozilla.com>
+Date: Fri, 19 Mar 2021 14:08:03 +0000 (2021-03-19)
+Subject: [PATCH] CVE-2021-29946
+
+---
+ netwerk/base/nsIOService.cpp     |  2 +-
+ netwerk/test/unit/test_altsvc.js | 57 ++++++++++++++++++++++++++++++++
+ 2 files changed, 58 insertions(+), 1 deletion(-)
+
+diff --git a/netwerk/base/nsIOService.cpp b/netwerk/base/nsIOService.cpp
+index 79abb1310f..f72cdf02b8 100644
+--- a/netwerk/base/nsIOService.cpp
++++ b/netwerk/base/nsIOService.cpp
+@@ -1406,7 +1406,7 @@ nsIOService::AllowPort(int32_t inPort, const char* scheme, bool* _retval) {
+     return NS_OK;
+   }
+ 
+-  if (port == 0) {
++  if (port <= 0 || port >= std::numeric_limits<uint16_t>::max()) {
+     *_retval = false;
+     return NS_OK;
+   }
+diff --git a/netwerk/test/unit/test_altsvc.js b/netwerk/test/unit/test_altsvc.js
+index 57d4357cb3..4c4eaba6b6 100644
+--- a/netwerk/test/unit/test_altsvc.js
++++ b/netwerk/test/unit/test_altsvc.js
+@@ -468,6 +468,63 @@ function doTest16() {
+       do_test_finished();
+     },
+   });
++  nextTest = doTest19;
+   do_test_pending();
+   doTest();
+ }
++
++// Check we don't connect to blocked ports
++function doTest19() {
++  dump("doTest19()\n");
++  origin = httpFooOrigin;
++  nextTest = testsDone;
++  otherServer = Cc["@mozilla.org/network/server-socket;1"].createInstance(
++    Ci.nsIServerSocket
++  );
++  const BAD_PORT_U32 = 6667 + 65536;
++  otherServer.init(BAD_PORT_U32, true, -1);
++  Assert.ok(otherServer.port == 6667, "Trying to listen on port 6667");
++  xaltsvc = "localhost:" + BAD_PORT_U32;
++  dump("Blocked port: " + otherServer.port);
++  waitFor = 500;
++  otherServer.asyncListen({
++    onSocketAccepted() {
++      Assert.ok(false, "Got connection to socket when we didn't expect it!");
++    },
++    onStopListening() {
++      // We get closed when the entire file is done, which guarantees we get the socket accept
++      // if we do connect to the alt-svc header
++      do_test_finished();
++    },
++  });
++  nextTest = doTest20;
++  do_test_pending();
++  doTest();
++}
++function doTest20() {
++  dump("doTest20()\n");
++  origin = httpFooOrigin;
++  nextTest = testsDone;
++  otherServer = Cc["@mozilla.org/network/server-socket;1"].createInstance(
++    Ci.nsIServerSocket
++  );
++  const BAD_PORT_U64 = 6666 + 429496729;
++  otherServer.init(6666, true, -1);
++  Assert.ok(otherServer.port == 6666, "Trying to listen on port 6666");
++  xaltsvc = "localhost:" + BAD_PORT_U64;
++  dump("Blocked port: " + otherServer.port);
++  waitFor = 500;
++  otherServer.asyncListen({
++    onSocketAccepted() {
++      Assert.ok(false, "Got connection to socket when we didn't expect it!");
++    },
++    onStopListening() {
++      // We get closed when the entire file is done, which guarantees we get the socket accept
++      // if we do connect to the alt-svc header
++      do_test_finished();
++    },
++  });
++  do_test_pending();
++  doTest();
++}
++
+-- 
+2.27.0
+
diff --git a/mozjs78.spec b/mozjs78.spec
index 32c455715cf8644d03f25a99f0e32a1284760803..b9458f819c67c3840db073e3f455f6b68c49ad9e 100644
--- a/mozjs78.spec
+++ b/mozjs78.spec
@@ -2,7 +2,7 @@
 
 Name:           mozjs%{major}
 Version:        78.4.0
-Release:        3
+Release:        4
 Summary:        SpiderMonkey JavaScript library
 License:        MPLv2.0 and MPLv1.1 and BSD and GPLv2+ and GPLv3+ and LGPLv2+ and AFL and ASL 2.0
 URL:            https://developer.mozilla.org/en-US/docs/Mozilla/Projects/SpiderMonkey
@@ -26,6 +26,7 @@ Patch10:        Fix-build-with-rust-nightly.patch
 Patch11:        backport-CVE-2023-23599.patch
 Patch12:        backport-CVE-2023-23601.patch
 Patch13:        backport-CVE-2023-23602.patch
+Patch14:        CVE-2021-29946.patch
 
 BuildRequires:  autoconf213 cargo clang-devel gcc gcc-c++ perl-devel pkgconfig(libffi) pkgconfig(zlib) 
 BuildRequires:  python3-devel python3-six readline-devel zip nasm llvm llvm-devel icu rust
@@ -105,6 +106,9 @@ popd
 %doc js/src/README.html
 
 %changelog
+* Mon May 13 2024 lvfei <lvfei@kylinos.cn> - - 78.4.0-4
+- fix CVE-2021-29946
+
 * Mon Apr 08 2024 sunhai <sunhai10@huawei.com> - 78.4.0-3
 - fix CVEs