diff --git a/djvulibre-3.5.27-check-input-pool.patch b/djvulibre-3.5.27-check-input-pool.patch
new file mode 100644
index 0000000..26e08e9
--- /dev/null
+++ b/djvulibre-3.5.27-check-input-pool.patch
@@ -0,0 +1,13 @@
+diff --git a/libdjvu/DataPool.cpp b/libdjvu/DataPool.cpp
+index 5fcbedf..4c2eaf0 100644
+--- a/libdjvu/DataPool.cpp
++++ b/libdjvu/DataPool.cpp
+@@ -791,6 +791,8 @@ DataPool::create(const GP<DataPool> & pool, int start, int length)
+   DEBUG_MSG("DataPool::DataPool: pool=" << (void *)((DataPool *)pool) << " start=" << start << " length= " << length << "\n");
+   DEBUG_MAKE_INDENT(3);
+ 
++  if (!pool) G_THROW( ERR_MSG("DataPool.zero_DataPool") );
++
+   DataPool *xpool=new DataPool();
+   GP<DataPool> retval=xpool;
+   xpool->init();
diff --git a/djvulibre.spec b/djvulibre.spec
index b2049a9..f29708e 100644
--- a/djvulibre.spec
+++ b/djvulibre.spec
@@ -3,7 +3,7 @@
 Summary: DjVu viewers, encoders, and utilities
 Name: djvulibre
 Version: 3.5.27
-Release: 25%{?dist}
+Release: 26%{?dist}
 License: GPLv2+
 URL: http://djvu.sourceforge.net/
 Source0: http://downloads.sourceforge.net/djvu/%{name}-%{version}.tar.gz
@@ -17,6 +17,7 @@ Patch6: djvulibre-3.5.27-export-file.patch
 Patch7: djvulibre-3.5.27-null-dereference.patch
 Patch8: djvulibre-3.5.27-check-image-size.patch
 Patch9: djvulibre-3.5.27-integer-overflow.patch
+Patch10: djvulibre-3.5.27-check-input-pool.patch
 
 Requires(post): xdg-utils
 Requires(preun): xdg-utils
@@ -78,6 +79,7 @@ Development files for DjVuLibre.
 %patch7 -p1 -b .null-dereference
 %patch8 -p1 -b .check-image-size
 %patch9 -p1 -b .integer-overflow
+%patch10 -p1 -b .check-input-pool
 
 
 %build 
@@ -185,6 +187,10 @@ fi
 
 
 %changelog
+* Mon May 03 2021 Marek Kasik <mkasik@redhat.com> - 3.5.27-26
+- Check input pool for NULL
+- Resolves: #1943410
+
 * Mon May 03 2021 Marek Kasik <mkasik@redhat.com> - 3.5.27-25
 - Avoid integer overflow when allocating bitmap
 - Resolves: #1943409