diff --git a/meta/recipes-support/libproxy/libproxy/libproxy-0.4.7-CVE-2012-4504.patch b/meta/recipes-support/libproxy/libproxy/libproxy-0.4.7-CVE-2012-4504.patch
index 323a571..cc1d508 100644
--- a/meta/recipes-support/libproxy/libproxy/libproxy-0.4.7-CVE-2012-4504.patch
+++ b/meta/recipes-support/libproxy/libproxy/libproxy-0.4.7-CVE-2012-4504.patch
@@ -1,3 +1,13 @@
+Reference:https://code.google.com/p/libproxy/source/detail?r=853
+
+Stack-based buffer overflow in the url::get_pac function in url.cpp
+in libproxy 0.4.x before 0.4.9 allows remote servers to have an
+unspecified impact via a large proxy.pac file.
+
+http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2012-4504
+
+Signed-off-by: yanjun.zhu <yanjun.zhu@windriver.com> 
+
 diff -urpN a/libproxy/url.cpp b/libproxy/url.cpp
 --- a/libproxy/url.cpp	2012-11-26 10:08:47.000000000 +0800
 +++ b/libproxy/url.cpp	2012-11-26 10:05:54.000000000 +0800