diff --git a/pkgs/development/libraries/libtomcrypt/default.nix b/pkgs/development/libraries/libtomcrypt/default.nix
index d9e9df59324d..4587701011dd 100644
--- a/pkgs/development/libraries/libtomcrypt/default.nix
+++ b/pkgs/development/libraries/libtomcrypt/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, libtool }:
+{ stdenv, fetchurl, fetchpatch, libtool }:
 
 stdenv.mkDerivation rec {
   pname = "libtomcrypt";
@@ -9,6 +9,14 @@ stdenv.mkDerivation rec {
     sha256 = "113vfrgapyv72lalhd3nkw7jnks8az0gcb5wqn9hj19nhcxlrbcn";
   };
 
+  patches = [
+    (fetchpatch {
+      name = "CVE-2019-17362.patch";
+      url = "https://github.com/libtom/libtomcrypt/pull/508/commits/25c26a3b7a9ad8192ccc923e15cf62bf0108ef94.patch";
+      sha256 = "1bwsj0pwffxw648wd713z3xcyrbxc2z646psrzp38ys564fjh5zf";
+    })
+  ];
+
   nativeBuildInputs = [ libtool ];
 
   postPatch = ''