--- /dev/null
+From cd1eb08076c8b8e310d4d553d427763f2577a1b6 Mon Sep 17 00:00:00 2001
+From: Hiroshi SHIBATA <hsbt@ruby-lang.org>
+Date: Fri, 21 Feb 2025 15:53:31 +0900
+Subject: [PATCH] Escape/unescape unclosed tags as well
+
+Co-authored-by: Nobuyoshi Nakada <nobu@ruby-lang.org>
+
+Upstream-Status: Backport [https://github.com/ruby/cgi/commit/cd1eb08076c8b8e310d4d553d427763f2577a1b6]
+CVE: CVE-2025-27220
+Signed-off-by: Hitendra Prajapati <hprajapati@mvista.com>
+---
+ lib/cgi/util.rb | 4 ++--
+ test/cgi/test_cgi_util.rb | 18 ++++++++++++++++++
+ 2 files changed, 20 insertions(+), 2 deletions(-)
+
+diff --git a/lib/cgi/util.rb b/lib/cgi/util.rb
+index 5a5c77a..ce77a0c 100644
+--- a/lib/cgi/util.rb
++++ b/lib/cgi/util.rb
+@@ -178,7 +178,7 @@ module CGI::Util
+ def escapeElement(string, *elements)
+ elements = elements[0] if elements[0].kind_of?(Array)
+ unless elements.empty?
+- string.gsub(/<\/?(?:#{elements.join("|")})(?!\w)(?:.|\n)*?>/i) do
++ string.gsub(/<\/?(?:#{elements.join("|")})\b[^<>]*+>?/im) do
+ CGI.escapeHTML($&)
+ end
+ else
+@@ -198,7 +198,7 @@ module CGI::Util
+ def unescapeElement(string, *elements)
+ elements = elements[0] if elements[0].kind_of?(Array)
+ unless elements.empty?
+- string.gsub(/<\/?(?:#{elements.join("|")})(?!\w)(?:.|\n)*?>/i) do
++ string.gsub(/<\/?(?:#{elements.join("|")})\b(?>[^&]+|&(?![gl]t;)\w+;)*(?:>)?/im) do
+ unescapeHTML($&)
+ end
+ else
+diff --git a/test/cgi/test_cgi_util.rb b/test/cgi/test_cgi_util.rb
+index a3be193..d058ccc 100644
+--- a/test/cgi/test_cgi_util.rb
++++ b/test/cgi/test_cgi_util.rb
+@@ -244,6 +244,14 @@ class CGIUtilTest < Test::Unit::TestCase
+ assert_equal("<BR><A HREF="url"></A>", escapeElement('<BR><A HREF="url"></A>', ["A", "IMG"]))
+ assert_equal("<BR><A HREF="url"></A>", escape_element('<BR><A HREF="url"></A>', "A", "IMG"))
+ assert_equal("<BR><A HREF="url"></A>", escape_element('<BR><A HREF="url"></A>', ["A", "IMG"]))
++
++ assert_equal("<A <A HREF="url"></A>", escapeElement('<A <A HREF="url"></A>', "A", "IMG"))
++ assert_equal("<A <A HREF="url"></A>", escapeElement('<A <A HREF="url"></A>', ["A", "IMG"]))
++ assert_equal("<A <A HREF="url"></A>", escape_element('<A <A HREF="url"></A>', "A", "IMG"))
++ assert_equal("<A <A HREF="url"></A>", escape_element('<A <A HREF="url"></A>', ["A", "IMG"]))
++
++ assert_equal("<A <A ", escapeElement('<A <A ', "A", "IMG"))
++ assert_equal("<A <A ", escapeElement('<A <A ', ["A", "IMG"]))
+ end
+
+
+@@ -252,6 +260,16 @@ class CGIUtilTest < Test::Unit::TestCase
+ assert_equal('<BR><A HREF="url"></A>', unescapeElement(escapeHTML('<BR><A HREF="url"></A>'), ["A", "IMG"]))
+ assert_equal('<BR><A HREF="url"></A>', unescape_element(escapeHTML('<BR><A HREF="url"></A>'), "A", "IMG"))
+ assert_equal('<BR><A HREF="url"></A>', unescape_element(escapeHTML('<BR><A HREF="url"></A>'), ["A", "IMG"]))
++
++ assert_equal('<A <A HREF="url"></A>', unescapeElement(escapeHTML('<A <A HREF="url"></A>'), "A", "IMG"))
++ assert_equal('<A <A HREF="url"></A>', unescapeElement(escapeHTML('<A <A HREF="url"></A>'), ["A", "IMG"]))
++ assert_equal('<A <A HREF="url"></A>', unescape_element(escapeHTML('<A <A HREF="url"></A>'), "A", "IMG"))
++ assert_equal('<A <A HREF="url"></A>', unescape_element(escapeHTML('<A <A HREF="url"></A>'), ["A", "IMG"]))
++
++ assert_equal('<A <A ', unescapeElement(escapeHTML('<A <A '), "A", "IMG"))
++ assert_equal('<A <A ', unescapeElement(escapeHTML('<A <A '), ["A", "IMG"]))
++ assert_equal('<A <A ', unescape_element(escapeHTML('<A <A '), "A", "IMG"))
++ assert_equal('<A <A ', unescape_element(escapeHTML('<A <A '), ["A", "IMG"]))
+ end
+ end
+
+--
+2.25.1
+