diff --git a/pcre2-10.33-RC1-Fix-a-crash-in-pcre2_substitute-if-mcontext-is-NULL.patch b/pcre2-10.33-RC1-Fix-a-crash-in-pcre2_substitute-if-mcontext-is-NULL.patch
new file mode 100644
index 0000000..f4ee03b
--- /dev/null
+++ b/pcre2-10.33-RC1-Fix-a-crash-in-pcre2_substitute-if-mcontext-is-NULL.patch
@@ -0,0 +1,43 @@
+From 25c6e08a2c43d50140401e620fff11aa0670effd Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Petr=20P=C3=ADsa=C5=99?= <ppisar@redhat.com>
+Date: Mon, 11 Mar 2019 12:52:10 +0100
+Subject: [PATCH] Fix a crash in pcre2_substitute() if mcontext is NULL
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+A regression introduced in:
+
+    commit 3c2c4493cc3b12dddd2493b465f0ce50e3f77b5a
+    Author: ph10 <ph10@6239d852-aaf2-0410-a92c-79f79f948069>
+    Date:   Tue Sep 18 16:31:30 2018 +0000
+
+	Implement callouts from pcre2_substitute().
+	git-svn-id: svn://vcs.exim.org/pcre2/code/trunk@1012 6239d852-aaf2-0410-a92c-79f79f948069
+
+causes a crash in pcre2_substitute() if called with a NULL mcontext argument.
+This patch ffixes it.
+
+<https://bugs.exim.org/show_bug.cgi?id=2382>
+
+Signed-off-by: Petr Písař <ppisar@redhat.com>
+---
+ src/pcre2_substitute.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/pcre2_substitute.c b/src/pcre2_substitute.c
+index 0b46629..0b63ef4 100644
+--- a/src/pcre2_substitute.c
++++ b/src/pcre2_substitute.c
+@@ -839,7 +839,7 @@ do
+   remembered. Do the callout if there is one and we have done an actual 
+   replacement. */
+   
+-  if (!overflowed && mcontext->substitute_callout != NULL)
++  if (!overflowed && mcontext != NULL && mcontext->substitute_callout != NULL)
+     {
+     scb.subscount = subs;  
+     scb.output_offsets[1] = buff_offset;
+-- 
+2.20.1
+
diff --git a/pcre2.spec b/pcre2.spec
index aa49e66..ff14c64 100644
--- a/pcre2.spec
+++ b/pcre2.spec
@@ -9,7 +9,7 @@
 %global rcversion RC1
 Name:       pcre2
 Version:    10.33
-Release:    %{?rcversion:0.}1%{?rcversion:.%rcversion}%{?dist}
+Release:    %{?rcversion:0.}2%{?rcversion:.%rcversion}%{?dist}
 %global     myversion %{version}%{?rcversion:-%rcversion}
 Summary:    Perl-compatible regular expression library
 # the library:                          BSD with exceptions
@@ -49,6 +49,9 @@ URL:        http://www.pcre.org/
 Source:     ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/%{?rcversion:Testing/}%{name}-%{myversion}.tar.bz2
 # Do no set RPATH if libdir is not /usr/lib
 Patch0:     pcre2-10.10-Fix-multilib.patch
+# Fix a crash in pcre2_substitute() function if mcontext argument is NULL,
+# bug #1686434, upstream bug #2382, proposed to upstream
+Patch1:     pcre2-10.33-RC1-Fix-a-crash-in-pcre2_substitute-if-mcontext-is-NULL.patch
 BuildRequires:  autoconf
 BuildRequires:  automake
 BuildRequires:  coreutils
@@ -125,6 +128,7 @@ Utilities demonstrating PCRE2 capabilities like pcre2grep or pcre2test.
 %prep
 %setup -q -n %{name}-%{myversion}
 %patch0 -p1
+%patch1 -p1
 # Because of multilib patch
 libtoolize --copy --force
 autoreconf -vif
@@ -223,6 +227,10 @@ make %{?_smp_mflags} check VERBOSE=yes
 %{_mandir}/man1/pcre2test.*
 
 %changelog
+* Mon Mar 11 2019 Petr Pisar <ppisar@redhat.com> - 10.33-0.2.RC1
+- Fix a crash in pcre2_substitute() function if mcontext argument is NULL
+  (bug #1686434)
+
 * Tue Mar 05 2019 Petr Pisar <ppisar@redhat.com> - 10.33-0.1.RC1
 - 10.33-RC1 bump