diff --git a/poppler-0.73.0-check-catalog-is-dict.patch b/poppler-0.73.0-check-catalog-is-dict.patch
new file mode 100644
index 0000000..f4b86eb
--- /dev/null
+++ b/poppler-0.73.0-check-catalog-is-dict.patch
@@ -0,0 +1,27 @@
+diff --git a/utils/pdfunite.cc b/utils/pdfunite.cc
+index 61613f60..462fb00c 100644
+--- a/utils/pdfunite.cc
++++ b/utils/pdfunite.cc
+@@ -165,7 +165,7 @@ int main (int argc, char *argv[])
+   for (i = 1; i < argc - 1; i++) {
+     GooString *gfileName = new GooString(argv[i]);
+     PDFDoc *doc = new PDFDoc(gfileName, nullptr, nullptr, nullptr);
+-    if (doc->isOk() && !doc->isEncrypted()) {
++    if (doc->isOk() && !doc->isEncrypted() && doc->getXRef()->getCatalog().isDict()) {
+       docs.push_back(doc);
+       if (doc->getPDFMajorVersion() > majorVersion) {
+         majorVersion = doc->getPDFMajorVersion();
+@@ -175,9 +175,12 @@ int main (int argc, char *argv[])
+           minorVersion = doc->getPDFMinorVersion();
+         }
+       }
+-    } else if (doc->isOk()) {
++    } else if (doc->isEncrypted()) {
+       error(errUnimplemented, -1, "Could not merge encrypted files ('{0:s}')", argv[i]);
+       return -1;
++    } else if (!doc->getXRef()->getCatalog().isDict()) {
++      error(errSyntaxError, -1, "Catalog is not a dictionary ('{0:s}')", argv[i]);
++      return -1;
+     } else {
+       error(errSyntaxError, -1, "Could not merge damaged documents ('{0:s}')", argv[i]);
+       return -1;
diff --git a/poppler.spec b/poppler.spec
index a7e2f23..436d968 100644
--- a/poppler.spec
+++ b/poppler.spec
@@ -4,7 +4,7 @@
 Summary: PDF rendering library
 Name:    poppler
 Version: 0.73.0
-Release: 3%{?dist}
+Release: 4%{?dist}
 License: (GPLv2 or GPLv3) and GPLv2+ and LGPLv2+ and MIT
 URL:     http://poppler.freedesktop.org/
 Source0: http://poppler.freedesktop.org/poppler-%{version}.tar.xz
@@ -25,6 +25,9 @@ Patch7:  poppler-0.67.0-qt4-const.patch
 # https://bugzilla.redhat.com/show_bug.cgi?id=1672419
 Patch8:  poppler-0.73.0-negative-xref-indices.patch
 
+# https://bugzilla.redhat.com/show_bug.cgi?id=1665273
+Patch9:  poppler-0.73.0-check-catalog-is-dict.patch
+
 BuildRequires: cmake
 BuildRequires: gcc-c++
 BuildRequires: gettext-devel
@@ -255,6 +258,10 @@ test "$(pkg-config --modversion poppler-splash)" = "%{version}"
 %{_mandir}/man1/*
 
 %changelog
+* Wed Feb 20 2019 Marek Kasik <mkasik@redhat.com> - 0.73.0-4
+- Check Catalog from XRef for being a Dict
+- Resolves: #1665274
+
 * Wed Feb 20 2019 Marek Kasik <mkasik@redhat.com> - 0.73.0-3
 - Defend against requests for negative XRef indices
 - Resolves: #1672420