opentoonz-libtiff: Note knownVulnerabilities

pkgs/applications/graphics/opentoonz/libtiff.nix

@@ -34,6 +34,23 @@ in stdenv.mkDerivation {
   '';
 
   meta = libtiff.meta // {
+    knownVulnerabilities = [''
+      Do not open untrusted files with Opentoonz:
+      Opentoonz uses an old custom fork of tibtiff from 2012 that is known to
+      be affected by at least these 50 vulnerabilities:
+        CVE-2012-4564 CVE-2013-4232 CVE-2013-4243 CVE-2013-4244 CVE-2014-8127
+        CVE-2014-8128 CVE-2014-8129 CVE-2014-8130 CVE-2014-9330 CVE-2015-1547
+        CVE-2015-8781 CVE-2015-8782 CVE-2015-8783 CVE-2015-8784 CVE-2015-8870
+        CVE-2016-3620 CVE-2016-3621 CVE-2016-3623 CVE-2016-3624 CVE-2016-3625
+        CVE-2016-3631 CVE-2016-3632 CVE-2016-3633 CVE-2016-3634 CVE-2016-3658
+        CVE-2016-3945 CVE-2016-3990 CVE-2016-3991 CVE-2016-5102 CVE-2016-5314
+        CVE-2016-5315 CVE-2016-5316 CVE-2016-5318 CVE-2016-5319 CVE-2016-5321
+        CVE-2016-5322 CVE-2016-5323 CVE-2016-6223 CVE-2016-9453 CVE-2016-9532
+        CVE-2017-9935 CVE-2017-9937 CVE-2018-10963 CVE-2018-5360
+        CVE-2019-14973 CVE-2019-17546 CVE-2020-35521 CVE-2020-35522
+        CVE-2020-35523 CVE-2020-35524
+      More info at https://github.com/opentoonz/opentoonz/issues/4193
+    ''];
     maintainers = with lib.maintainers; [ chkno ];
   };
 }