diff --git a/pkgs/applications/terminal-emulators/eterm/default.nix b/pkgs/applications/terminal-emulators/eterm/default.nix
index 70b8311b105..b5ca8b88959 100644
--- a/pkgs/applications/terminal-emulators/eterm/default.nix
+++ b/pkgs/applications/terminal-emulators/eterm/default.nix
@@ -39,5 +39,8 @@ stdenv.mkDerivation rec {
     license = licenses.bsd2;
     maintainers = [ maintainers.AndersonTorres ];
     platforms = platforms.linux;
+    knownVulnerabilities = [
+      "Usage of ANSI escape sequences causes unexpected newline-termination, leading to unexpected command execution (https://www.openwall.com/lists/oss-security/2021/05/17/1)"
+    ];
   };
 }
diff --git a/pkgs/applications/terminal-emulators/mrxvt/default.nix b/pkgs/applications/terminal-emulators/mrxvt/default.nix
index b0b9ee61118..bd01b0843fb 100644
--- a/pkgs/applications/terminal-emulators/mrxvt/default.nix
+++ b/pkgs/applications/terminal-emulators/mrxvt/default.nix
@@ -36,5 +36,8 @@ stdenv.mkDerivation {
     homepage = "https://sourceforge.net/projects/materm";
     license = licenses.gpl2;
     platforms = platforms.linux;
+    knownVulnerabilities = [
+      "Usage of ANSI escape sequences causes unexpected newline-termination, leading to unexpected command execution (https://www.openwall.com/lists/oss-security/2021/05/17/1)"
+    ];
   };
 }
diff --git a/pkgs/applications/terminal-emulators/rxvt-unicode/default.nix b/pkgs/applications/terminal-emulators/rxvt-unicode/default.nix
index 82536e4b873..02f1b100f49 100644
--- a/pkgs/applications/terminal-emulators/rxvt-unicode/default.nix
+++ b/pkgs/applications/terminal-emulators/rxvt-unicode/default.nix
@@ -9,7 +9,7 @@
 
 let
   pname = "rxvt-unicode";
-  version = "9.22";
+  version = "9.26";
   description = "A clone of the well-known terminal emulator rxvt";
 
   desktopItem = makeDesktopItem {
@@ -31,7 +31,7 @@ stdenv.mkDerivation {
 
   src = fetchurl {
     url = "http://dist.schmorp.de/rxvt-unicode/Attic/rxvt-unicode-${version}.tar.bz2";
-    sha256 = "1pddjn5ynblwfrdmskylrsxb9vfnk3w4jdnq2l8xn2pspkljhip9";
+    sha256 = "12y9p32q0v7n7rhjla0j2g9d5rj2dmwk20c9yhlssaaxlawiccb4";
   };
 
   buildInputs =
diff --git a/pkgs/applications/terminal-emulators/rxvt/default.nix b/pkgs/applications/terminal-emulators/rxvt/default.nix
index 0cd4f13e465..a6f4ab1321c 100644
--- a/pkgs/applications/terminal-emulators/rxvt/default.nix
+++ b/pkgs/applications/terminal-emulators/rxvt/default.nix
@@ -35,5 +35,8 @@ stdenv.mkDerivation rec {
     maintainers = with maintainers; [ AndersonTorres ];
     license = licenses.gpl2;
     platforms = platforms.linux;
+    knownVulnerabilities = [
+      "Usage of ANSI escape sequences causes unexpected newline-termination, leading to unexpected command execution (https://www.openwall.com/lists/oss-security/2021/05/17/1)"
+    ];
   };
 }