diff --git a/pkgs/applications/graphics/graphicsmagick/cmyka-bounds.patch b/pkgs/applications/graphics/graphicsmagick/cmyka-bounds.patch
deleted file mode 100644
index dd375143277..00000000000
--- a/pkgs/applications/graphics/graphicsmagick/cmyka-bounds.patch
+++ /dev/null
@@ -1,36 +0,0 @@
-# HG changeset patch
-# User Bob Friesenhahn <bfriesen@GraphicsMagick.org>
-# Date 1487905610 21600
-# Node ID 6156b4c2992d855ece6079653b3b93c3229fc4b8
-# Parent  0392c4305a4369984ec8069055acc470c0a73647
-Fix out of bounds access when reading CMYKA tiff which claims wrong samples/pixel.
-
-diff -r 0392c4305a43 -r 6156b4c2992d coders/tiff.c
---- a/coders/tiff.c	Sun Jan 29 10:04:57 2017 -0600
-+++ b/coders/tiff.c	Thu Feb 23 21:06:50 2017 -0600
-@@ -1230,8 +1230,8 @@
-                   case 0:
-                     if (samples_per_pixel == 1)
-                       *quantum_type=GrayQuantum;
--                      else
--                        *quantum_type=RedQuantum;
-+                    else
-+                      *quantum_type=RedQuantum;
-                     break;
-                   case 1:
-                     *quantum_type=GreenQuantum;
-@@ -1411,12 +1411,12 @@
-               }
-             else
-               {
--                if (image->matte)
-+                if (image->matte && samples_per_pixel >= 5)
-                   {
-                     *quantum_type=CMYKAQuantum;
-                     *quantum_samples=5;
-                   }
--                else
-+                else if (samples_per_pixel >= 4)
-                   {
-                     *quantum_type=CMYKQuantum;
-                     *quantum_samples=4;
diff --git a/pkgs/applications/graphics/graphicsmagick/default.nix b/pkgs/applications/graphics/graphicsmagick/default.nix
index 0858dfba8b4..c8c9ac8f26e 100644
--- a/pkgs/applications/graphics/graphicsmagick/default.nix
+++ b/pkgs/applications/graphics/graphicsmagick/default.nix
@@ -2,47 +2,18 @@
 , libjpeg, libpng, libtiff, libxml2, zlib, libtool, xz, libX11
 , libwebp, quantumdepth ? 8, fixDarwinDylibNames }:
 
-let version = "1.3.25"; in
+let version = "1.3.26"; in
 
 stdenv.mkDerivation {
   name = "graphicsmagick-${version}";
 
   src = fetchurl {
     url = "mirror://sourceforge/graphicsmagick/GraphicsMagick-${version}.tar.xz";
-    sha256 = "17xcc7pfcmiwpfr1g8ys5a7bdnvqzka53vg3kkzhwwz0s99gljyn";
+    sha256 = "122zgs96dqrys62mnh8x5yvfff6km4d3yrnvaxzg3mg5sprib87v";
   };
 
   patches = [
     ./disable-popen.patch
-    (fetchpatch {
-      url = "https://sources.debian.net/data/main/g/graphicsmagick/1.3.25-5/debian/patches/CVE-2016-7996_CVE-2016-7997.patch";
-      sha256 = "0xsby2z8n7cnnln7szjznq7iaabq323wymvdjra59yb41aix74r2";
-    })
-    (fetchpatch {
-      url = "https://sources.debian.net/data/main/g/graphicsmagick/1.3.25-5/debian/patches/CVE-2016-7800_part1.patch";
-      sha256 = "02s0x9bkbnm5wrd0d2x9ld4d9z5xqpfk310lyylyr5zlnhqxmwgn";
-    })
-    (fetchpatch {
-      url = "https://sources.debian.net/data/main/g/graphicsmagick/1.3.25-5/debian/patches/CVE-2016-7800_part2.patch";
-      sha256 = "1h4xv3i1aq5avsd584rwa5sa7ca8f7w9ggmh7j2llqq5kymwsv5f";
-    })
-    (fetchpatch {
-      url = "https://sources.debian.net/data/main/g/graphicsmagick/1.3.25-5/debian/patches/CVE-2016-8682.patch";
-      sha256 = "1wfirw2yi5y72657kvnbgjs0f9b3rs9nvk8gjbwhb9a03z9ws0y5";
-    })
-    (fetchpatch {
-      url = "https://sources.debian.net/data/main/g/graphicsmagick/1.3.25-5/debian/patches/CVE-2016-8683.patch";
-      sha256 = "102252zb34nj6alk1nhh1wbn3apd2v9rzk7clmm237332yj72vif";
-    })
-    (fetchpatch {
-      url = "https://sources.debian.net/data/main/g/graphicsmagick/1.3.25-5/debian/patches/CVE-2016-8684.patch";
-      sha256 = "1p36gpz904wnmbz1n64x4pdpg8lp9zs3gx0awklxqdvgl8m82vvy";
-    })
-    (fetchpatch {
-      url = "https://sources.debian.net/data/main/g/graphicsmagick/1.3.25-7/debian/patches/CVE-2016-9830.patch";
-      sha256 = "0qh15sd7nx7vf9sld4453iml951bwsx2fx84hxc7plhds2k3gjpa";
-    })
-    ./cmyka-bounds.patch
   ];
 
   configureFlags = [