diff --git a/pkgs/development/libraries/openjpeg/2.x.nix b/pkgs/development/libraries/openjpeg/2.x.nix
index 24f3752ef435..c9b22f50af18 100644
--- a/pkgs/development/libraries/openjpeg/2.x.nix
+++ b/pkgs/development/libraries/openjpeg/2.x.nix
@@ -23,5 +23,10 @@ callPackage ./generic.nix (args // rec {
       name = "CVE-2019-12973-2.patch";
       sha256 = "1jkkfw13l7nx4hxdhc7z17f4vfgqcaf09zpl235kypbxx1ygc7vq";
     })
+    (fetchpatch {
+      url = "https://github.com/uclouvain/openjpeg/commit/024b8407392cb0b82b04b58ed256094ed5799e04.patch";
+      name = "CVE-2020-6851.patch";
+      sha256 = "1lfwlzqxb69cwzjp8v9lijz4c2qhf3b8m6sq1khipqlgrb3l58xw";
+    })
   ];
 })