diff --git a/perl-5.31.2-regcomp.c-Don-t-read-off-the-end-of-buffer.patch b/perl-5.31.2-regcomp.c-Don-t-read-off-the-end-of-buffer.patch
new file mode 100644
index 0000000..ff5d596
--- /dev/null
+++ b/perl-5.31.2-regcomp.c-Don-t-read-off-the-end-of-buffer.patch
@@ -0,0 +1,36 @@
+From 31532982b04c20a43aa9c3d26780e3591c524fbc Mon Sep 17 00:00:00 2001
+From: Karl Williamson <khw@cpan.org>
+Date: Thu, 27 Jun 2019 15:39:11 -0600
+Subject: [PATCH] regcomp.c: Don't read off the end of buffer
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Until this commit, it was possible that \p{nv=3/} would cause the right
+brace to be considered part of the property name.
+
+Spotted by Hugo van der Sanden
+
+Signed-off-by: Petr Písař <ppisar@redhat.com>
+---
+ regcomp.c | 4 +++-
+ 1 file changed, 3 insertions(+), 1 deletion(-)
+
+diff --git a/regcomp.c b/regcomp.c
+index 1117998fc8..cf9246473f 100644
+--- a/regcomp.c
++++ b/regcomp.c
+@@ -23092,7 +23092,9 @@ Perl_parse_uniprop_string(pTHX_
+             }
+ 
+             /* Store the first real character in the denominator */
+-            lookup_name[j++] = name[i];
++            if (i < name_len) {
++                lookup_name[j++] = name[i];
++            }
+         }
+     }
+ 
+-- 
+2.21.0
+
diff --git a/perl.spec b/perl.spec
index ad3c149..cacf602 100644
--- a/perl.spec
+++ b/perl.spec
@@ -253,6 +253,10 @@ Patch49:        perl-5.31.2-PerlIO-Via-check-arg-is-non-NULL-before-using-it.pat
 # fixed after 5.31.2
 Patch50:        perl-5.30.0-perl-134266-make-sure-is-writable-when-we-write-to-i.patch
 
+# Fix parsing a denominator when parsing a Unicode property name,
+# fixed after 5.31.2
+Patch51:        perl-5.31.2-regcomp.c-Don-t-read-off-the-end-of-buffer.patch
+
 # Link XS modules to libperl.so with EU::CBuilder on Linux, bug #960048
 Patch200:       perl-5.16.3-Link-XS-modules-to-libperl.so-with-EU-CBuilder-on-Li.patch
 
@@ -2825,6 +2829,7 @@ Perl extension for Version Objects
 %patch48 -p1
 %patch49 -p1
 %patch50 -p1
+%patch51 -p1
 %patch200 -p1
 %patch201 -p1
 
@@ -2882,6 +2887,7 @@ perl -x patchlevel.h \
     'Fedora Patch48: Fix a use after free in debugging output of a collation' \
     'Fedora Patch49: Fix a NULL pointer dereference in PerlIOVia_pushed()' \
     'Fedora Patch50: Fix a crash when setting $@ on unwinding a call stack (RT#134266)' \
+    'Fedora Patch51: Fix parsing a denominator when parsing a Unicode property name' \
     'Fedora Patch200: Link XS modules to libperl.so with EU::CBuilder on Linux' \
     'Fedora Patch201: Link XS modules to libperl.so with EU::MM on Linux' \
     %{nil}
@@ -5130,6 +5136,7 @@ popd
 * Thu Aug 22 2019 Petr Pisar <ppisar@redhat.com> - 4:5.30.0-444
 - Fix a NULL pointer dereference in PerlIOVia_pushed()
 - Fix a crash when setting $@ on unwinding a call stack (RT#134266)
+- Fix parsing a denominator when parsing a Unicode property name
 
 * Wed Aug 07 2019 Petr Pisar <ppisar@redhat.com> - 4:5.30.0-443
 - Fix propagating non-string variables in an exception value (RT#134291)