diff --git a/pkgs/applications/virtualization/virtualbox/default.nix b/pkgs/applications/virtualization/virtualbox/default.nix
index af0d5c7fffb3..842985dce5bb 100644
--- a/pkgs/applications/virtualization/virtualbox/default.nix
+++ b/pkgs/applications/virtualization/virtualbox/default.nix
@@ -14,7 +14,7 @@ with stdenv.lib;
 let
   buildType = "release";
 
-  version = "4.3.24"; # changes ./guest-additions as well
+  version = "4.3.26"; # changes ./guest-additions as well
 
   forEachModule = action: ''
     for mod in \
@@ -35,13 +35,13 @@ let
   '';
 
   # See https://github.com/NixOS/nixpkgs/issues/672 for details
-  extpackRevision = "98716";
+  extpackRevision = "98988";
   extensionPack = requireFile rec {
     name = "Oracle_VM_VirtualBox_Extension_Pack-${version}-${extpackRevision}.vbox-extpack";
     # IMPORTANT: Hash must be base16 encoded because it's used as an input to
     # VBoxExtPackHelperApp!
     # Tip: see http://dlc.sun.com.edgesuite.net/virtualbox/4.3.10/SHA256SUMS
-    sha256 = "c6b61774e323b70da0d4f5677ef56f1c53990eccef859d3c720d814f98a01f8d";
+    sha256 = "4e39a6d0da23799a31c3f6a4022b144ef3ddfe30c523e51b21bf7d9ebade62ce";
     message = ''
       In order to use the extension pack, you need to comply with the VirtualBox Personal Use
       and Evaluation License (PUEL) by downloading the related binaries from:
@@ -60,7 +60,7 @@ in stdenv.mkDerivation {
 
   src = fetchurl {
     url = "http://download.virtualbox.org/virtualbox/${version}/VirtualBox-${version}.tar.bz2";
-    sha256 = "e2123c9b6100fdd52a9b436fe29aa7215fce17c26904583977c1160b11b170cc";
+    sha256 = "e2949c250a1de30997e658de9e3d8545e71318a9844d80536137d76db4f08961";
   };
 
   buildInputs =
diff --git a/pkgs/applications/virtualization/virtualbox/guest-additions/default.nix b/pkgs/applications/virtualization/virtualbox/guest-additions/default.nix
index 56fe2b1083c9..e63f69ca2306 100644
--- a/pkgs/applications/virtualization/virtualbox/guest-additions/default.nix
+++ b/pkgs/applications/virtualization/virtualbox/guest-additions/default.nix
@@ -12,7 +12,7 @@ stdenv.mkDerivation {
 
   src = fetchurl {
     url = "http://download.virtualbox.org/virtualbox/${version}/VBoxGuestAdditions_${version}.iso";
-    sha256 = "df4385aaa80f322ee2acda0657a53d9ca5c489e695ee5f9776574b67c649c960";
+    sha256 = "c5e46533a6ff8df177ed5c9098624f6cec46ca392bab16de2017195580088670";
   };
 
   KERN_DIR = "${kernel.dev}/lib/modules/*/build";