diff --git a/d3xp/Game_local.cpp b/d3xp/Game_local.cpp
index 0489186..0b1252e 100644
--- a/d3xp/Game_local.cpp
+++ b/d3xp/Game_local.cpp
@@ -1222,7 +1222,7 @@ bool idGameLocal::NextMap( void ) {
 	int					i;
 
 	if ( !g_mapCycle.GetString()[0] ) {
-		Printf( common->GetLanguageDict()->GetString( "#str_04294" ) );
+		Printf( "%s", common->GetLanguageDict()->GetString( "#str_04294" ) );
 		return false;
 	}
 	if ( fileSystem->ReadFile( g_mapCycle.GetString(), NULL, NULL ) < 0 ) {
diff --git a/d3xp/Game_network.cpp b/d3xp/Game_network.cpp
index 7c3bb14..1fd7023 100644
--- a/d3xp/Game_network.cpp
+++ b/d3xp/Game_network.cpp
@@ -734,7 +734,7 @@ void idGameLocal::NetworkEventWarning( const entityNetEvent_t *event, const char
 	va_end( argptr );
 	idStr::Append( buf, sizeof(buf), "\n" );
 
-	common->DWarning( buf );
+	common->DWarning( "%s", buf );
 }
 
 /*
diff --git a/d3xp/MultiplayerGame.cpp b/d3xp/MultiplayerGame.cpp
index ec9dfa8..4af570c 100644
--- a/d3xp/MultiplayerGame.cpp
+++ b/d3xp/MultiplayerGame.cpp
@@ -2847,10 +2847,10 @@ void idMultiplayerGame::PrintMessageEvent( int to, msg_evt_t evt, int parm1, int
 			AddChatLine( common->GetLanguageDict()->GetString( "#str_04289" ), gameLocal.userInfo[ parm1 ].GetString( "ui_name" ) );
 			break;
 		case MSG_VOTE:
-			AddChatLine( common->GetLanguageDict()->GetString( "#str_04288" ) );
+			AddChatLine( "%s", common->GetLanguageDict()->GetString( "#str_04288" ) );
 			break;
 		case MSG_SUDDENDEATH:
-			AddChatLine( common->GetLanguageDict()->GetString( "#str_04287" ) );
+			AddChatLine( "%s", common->GetLanguageDict()->GetString( "#str_04287" ) );
 			break;
 		case MSG_FORCEREADY:
 			AddChatLine( common->GetLanguageDict()->GetString( "#str_04286" ), gameLocal.userInfo[ parm1 ].GetString( "ui_name" ) );
@@ -2862,7 +2862,7 @@ void idMultiplayerGame::PrintMessageEvent( int to, msg_evt_t evt, int parm1, int
 			AddChatLine( common->GetLanguageDict()->GetString( "#str_04285" ), gameLocal.userInfo[ parm1 ].GetString( "ui_name" ) );
 			break;
 		case MSG_TIMELIMIT:
-			AddChatLine( common->GetLanguageDict()->GetString( "#str_04284" ) );
+			AddChatLine( "%s", common->GetLanguageDict()->GetString( "#str_04284" ) );
 			break;
 		case MSG_FRAGLIMIT:
 			if ( gameLocal.gameType == GAME_LASTMAN ) {
@@ -2877,7 +2877,7 @@ void idMultiplayerGame::PrintMessageEvent( int to, msg_evt_t evt, int parm1, int
 			AddChatLine( common->GetLanguageDict()->GetString( "#str_04280" ), gameLocal.userInfo[ parm1 ].GetString( "ui_name" ), parm2 ? common->GetLanguageDict()->GetString( "#str_02500" ) : common->GetLanguageDict()->GetString( "#str_02499" ) );
 			break;
 		case MSG_HOLYSHIT:
-			AddChatLine( common->GetLanguageDict()->GetString( "#str_06732" ) );
+			AddChatLine( "%s", common->GetLanguageDict()->GetString( "#str_06732" ) );
 			break;
 #ifdef CTF
 		case MSG_POINTLIMIT:
@@ -2903,9 +2903,9 @@ void idMultiplayerGame::PrintMessageEvent( int to, msg_evt_t evt, int parm1, int
 				break;
 
 			if ( gameLocal.GetLocalPlayer()->team != parm1 ) {
-				AddChatLine( common->GetLanguageDict()->GetString( "#str_11103" ) );	// your team
+				AddChatLine( "%s", common->GetLanguageDict()->GetString( "#str_11103" ) );	// your team
 			} else {
-				AddChatLine( common->GetLanguageDict()->GetString( "#str_11104" ) );	// enemy
+				AddChatLine( "%s", common->GetLanguageDict()->GetString( "#str_11104" ) );	// enemy
 			}
 			break;
 
@@ -3262,7 +3262,7 @@ void idMultiplayerGame::ClientStartVote( int clientNum, const char *_voteString
 	}
 
 	voteString = _voteString;
-	AddChatLine( va( common->GetLanguageDict()->GetString( "#str_04279" ), gameLocal.userInfo[ clientNum ].GetString( "ui_name" ) ) );
+	AddChatLine( common->GetLanguageDict()->GetString( "#str_04279" ), gameLocal.userInfo[ clientNum ].GetString( "ui_name" ) );
 	gameSoundWorld->PlayShaderDirectly( GlobalSoundStrings[ SND_VOTE ] );
 	if ( clientNum == gameLocal.localClientNum ) {
 		voted = true;
@@ -3302,14 +3302,14 @@ void idMultiplayerGame::ClientUpdateVote( vote_result_t status, int yesCount, in
 
 	switch ( status ) {
 		case VOTE_FAILED:
-			AddChatLine( common->GetLanguageDict()->GetString( "#str_04278" ) );
+			AddChatLine( "%s", common->GetLanguageDict()->GetString( "#str_04278" ) );
 			gameSoundWorld->PlayShaderDirectly( GlobalSoundStrings[ SND_VOTE_FAILED ] );
 			if ( gameLocal.isClient ) {
 				vote = VOTE_NONE;
 			}
 			break;
 		case VOTE_PASSED:
-			AddChatLine( common->GetLanguageDict()->GetString( "#str_04277" ) );
+			AddChatLine( "%s", common->GetLanguageDict()->GetString( "#str_04277" ) );
 			gameSoundWorld->PlayShaderDirectly( GlobalSoundStrings[ SND_VOTE_PASSED ] );
 			break;
 		case VOTE_RESET:
@@ -3318,7 +3318,7 @@ void idMultiplayerGame::ClientUpdateVote( vote_result_t status, int yesCount, in
 			}
 			break;
 		case VOTE_ABORTED:
-			AddChatLine( common->GetLanguageDict()->GetString( "#str_04276" ) );
+			AddChatLine( "%s", common->GetLanguageDict()->GetString( "#str_04276" ) );
 			if ( gameLocal.isClient ) {
 				vote = VOTE_NONE;
 			}
@@ -3856,7 +3856,7 @@ void idMultiplayerGame::ToggleSpectate( void ) {
 		if ( gameLocal.serverInfo.GetBool( "si_spectators" ) ) {
 			cvarSystem->SetCVarString( "ui_spectate", "Spectate" );
 		} else {
-			gameLocal.mpGame.AddChatLine( common->GetLanguageDict()->GetString( "#str_06747" ) );
+			gameLocal.mpGame.AddChatLine( "%s", common->GetLanguageDict()->GetString( "#str_06747" ) );
 		}
 	}
 }
diff --git a/d3xp/gamesys/SysCmds.cpp b/d3xp/gamesys/SysCmds.cpp
index 9871fe0..cc63b8f 100644
--- a/d3xp/gamesys/SysCmds.cpp
+++ b/d3xp/gamesys/SysCmds.cpp
@@ -691,7 +691,7 @@ Cmd_AddChatLine_f
 ==================
 */
 static void Cmd_AddChatLine_f( const idCmdArgs &args ) {
-	gameLocal.mpGame.AddChatLine( args.Argv( 1 ) );
+	gameLocal.mpGame.AddChatLine( "%s", args.Argv( 1 ) );
 }
 
 /*
@@ -1294,7 +1294,7 @@ static void PrintFloat( float f ) {
 		buf[i] = ' ';
 	}
 	buf[i] = '\0';
-	gameLocal.Printf( buf );
+	gameLocal.Printf( "%s", buf );
 }
 
 /*
diff --git a/d3xp/script/Script_Thread.cpp b/d3xp/script/Script_Thread.cpp
index cb82633..28becac 100644
--- a/d3xp/script/Script_Thread.cpp
+++ b/d3xp/script/Script_Thread.cpp
@@ -817,7 +817,7 @@ void idThread::Error( const char *fmt, ... ) const {
 	vsprintf( text, fmt, argptr );
 	va_end( argptr );
 
-	interpreter.Error( text );
+	interpreter.Error( "%s", text );
 }
 
 /*
@@ -833,7 +833,7 @@ void idThread::Warning( const char *fmt, ... ) const {
 	vsprintf( text, fmt, argptr );
 	va_end( argptr );
 
-	interpreter.Warning( text );
+	interpreter.Warning( "%s", text );
 }
 
 /*
diff --git a/game/Game_local.cpp b/game/Game_local.cpp
index ae1eb86..a2cefa6 100644
--- a/game/Game_local.cpp
+++ b/game/Game_local.cpp
@@ -1084,7 +1084,7 @@ bool idGameLocal::NextMap( void ) {
 	int					i;
 
 	if ( !g_mapCycle.GetString()[0] ) {
-		Printf( common->GetLanguageDict()->GetString( "#str_04294" ) );
+		Printf( "%s", common->GetLanguageDict()->GetString( "#str_04294" ) );
 		return false;
 	}
 	if ( fileSystem->ReadFile( g_mapCycle.GetString(), NULL, NULL ) < 0 ) {
diff --git a/game/Game_network.cpp b/game/Game_network.cpp
index d7e2268..5e24df7 100644
--- a/game/Game_network.cpp
+++ b/game/Game_network.cpp
@@ -720,7 +720,7 @@ void idGameLocal::NetworkEventWarning( const entityNetEvent_t *event, const char
 	va_end( argptr );
 	idStr::Append( buf, sizeof(buf), "\n" );
 
-	common->DWarning( buf );
+	common->DWarning( "%s", buf );
 }
 
 /*
diff --git a/game/MultiplayerGame.cpp b/game/MultiplayerGame.cpp
index 94a0aff..11cce5e 100644
--- a/game/MultiplayerGame.cpp
+++ b/game/MultiplayerGame.cpp
@@ -554,11 +554,12 @@ const char *idMultiplayerGame::GameTime() {
 			ms = 0;
 		}
 
-		s = ms / 1000;
-		m = s / 60;
-		s -= m * 60;
-		t = s / 10;
-		s -= t * 10;
+		s = ms / 1000; // => s <= 2 147 483 (INT_MAX / 1000)
+		m = s / 60;  // => m <= 35 791
+		s -= m * 60; // => s < 60
+		t = s / 10;  // => t < 6
+		s -= t * 10; // => s < 10
+		// writing <= 5 for m + 3 bytes for ":ts" + 1 byte for \0 => 16 bytes is enough
 
 		sprintf( buff, "%i:%i%i", m, t, s );
 	}
@@ -2221,10 +2222,10 @@ void idMultiplayerGame::PrintMessageEvent( int to, msg_evt_t evt, int parm1, int
 			AddChatLine( common->GetLanguageDict()->GetString( "#str_04289" ), gameLocal.userInfo[ parm1 ].GetString( "ui_name" ) );
 			break;
 		case MSG_VOTE:
-			AddChatLine( common->GetLanguageDict()->GetString( "#str_04288" ) );
+			AddChatLine( "%s", common->GetLanguageDict()->GetString( "#str_04288" ) );
 			break;
 		case MSG_SUDDENDEATH:
-			AddChatLine( common->GetLanguageDict()->GetString( "#str_04287" ) );
+			AddChatLine( "%s", common->GetLanguageDict()->GetString( "#str_04287" ) );
 			break;
 		case MSG_FORCEREADY:
 			AddChatLine( common->GetLanguageDict()->GetString( "#str_04286" ), gameLocal.userInfo[ parm1 ].GetString( "ui_name" ) );
@@ -2236,7 +2237,7 @@ void idMultiplayerGame::PrintMessageEvent( int to, msg_evt_t evt, int parm1, int
 			AddChatLine( common->GetLanguageDict()->GetString( "#str_04285" ), gameLocal.userInfo[ parm1 ].GetString( "ui_name" ) );
 			break;
 		case MSG_TIMELIMIT:
-			AddChatLine( common->GetLanguageDict()->GetString( "#str_04284" ) );
+			AddChatLine( "%s", common->GetLanguageDict()->GetString( "#str_04284" ) );
 			break;
 		case MSG_FRAGLIMIT:
 			if ( gameLocal.gameType == GAME_LASTMAN ) {
@@ -2251,7 +2252,7 @@ void idMultiplayerGame::PrintMessageEvent( int to, msg_evt_t evt, int parm1, int
 			AddChatLine( common->GetLanguageDict()->GetString( "#str_04280" ), gameLocal.userInfo[ parm1 ].GetString( "ui_name" ), parm2 ? common->GetLanguageDict()->GetString( "#str_02500" ) : common->GetLanguageDict()->GetString( "#str_02499" ) );
 			break;
 		case MSG_HOLYSHIT:
-			AddChatLine( common->GetLanguageDict()->GetString( "#str_06732" ) );
+			AddChatLine( "%s", common->GetLanguageDict()->GetString( "#str_06732" ) );
 			break;
 		default:
 			gameLocal.DPrintf( "PrintMessageEvent: unknown message type %d\n", evt );
@@ -2570,7 +2571,7 @@ void idMultiplayerGame::ClientStartVote( int clientNum, const char *_voteString
 	}
 
 	voteString = _voteString;
-	AddChatLine( va( common->GetLanguageDict()->GetString( "#str_04279" ), gameLocal.userInfo[ clientNum ].GetString( "ui_name" ) ) );
+	AddChatLine( common->GetLanguageDict()->GetString( "#str_04279" ), gameLocal.userInfo[ clientNum ].GetString( "ui_name" ) );
 	gameSoundWorld->PlayShaderDirectly( GlobalSoundStrings[ SND_VOTE ] );
 	if ( clientNum == gameLocal.localClientNum ) {
 		voted = true;
@@ -2610,14 +2611,14 @@ void idMultiplayerGame::ClientUpdateVote( vote_result_t status, int yesCount, in
 
 	switch ( status ) {
 		case VOTE_FAILED:
-			AddChatLine( common->GetLanguageDict()->GetString( "#str_04278" ) );
+			AddChatLine( "%s", common->GetLanguageDict()->GetString( "#str_04278" ) );
 			gameSoundWorld->PlayShaderDirectly( GlobalSoundStrings[ SND_VOTE_FAILED ] );
 			if ( gameLocal.isClient ) {
 				vote = VOTE_NONE;
 			}
 			break;
 		case VOTE_PASSED:
-			AddChatLine( common->GetLanguageDict()->GetString( "#str_04277" ) );
+			AddChatLine( "%s", common->GetLanguageDict()->GetString( "#str_04277" ) );
 			gameSoundWorld->PlayShaderDirectly( GlobalSoundStrings[ SND_VOTE_PASSED ] );
 			break;
 		case VOTE_RESET:
@@ -2626,7 +2627,7 @@ void idMultiplayerGame::ClientUpdateVote( vote_result_t status, int yesCount, in
 			}
 			break;
 		case VOTE_ABORTED:
-			AddChatLine( common->GetLanguageDict()->GetString( "#str_04276" ) );
+			AddChatLine( "%s", common->GetLanguageDict()->GetString( "#str_04276" ) );
 			if ( gameLocal.isClient ) {
 				vote = VOTE_NONE;
 			}
@@ -3122,7 +3123,7 @@ void idMultiplayerGame::ToggleSpectate( void ) {
 		if ( gameLocal.serverInfo.GetBool( "si_spectators" ) ) {
 			cvarSystem->SetCVarString( "ui_spectate", "Spectate" );
 		} else {
-			gameLocal.mpGame.AddChatLine( common->GetLanguageDict()->GetString( "#str_06747" ) );
+			gameLocal.mpGame.AddChatLine( "%s", common->GetLanguageDict()->GetString( "#str_06747" ) );
 		}
 	}
 }
diff --git a/game/gamesys/SysCmds.cpp b/game/gamesys/SysCmds.cpp
index 732d506..105ff57 100644
--- a/game/gamesys/SysCmds.cpp
+++ b/game/gamesys/SysCmds.cpp
@@ -622,7 +622,7 @@ Cmd_AddChatLine_f
 ==================
 */
 static void Cmd_AddChatLine_f( const idCmdArgs &args ) {
-	gameLocal.mpGame.AddChatLine( args.Argv( 1 ) );
+	gameLocal.mpGame.AddChatLine( "%s", args.Argv( 1 ) );
 }
 
 /*
@@ -1225,7 +1225,7 @@ static void PrintFloat( float f ) {
 		buf[i] = ' ';
 	}
 	buf[i] = '\0';
-	gameLocal.Printf( buf );
+	gameLocal.Printf( "%s", buf );
 }
 
 /*
diff --git a/game/script/Script_Thread.cpp b/game/script/Script_Thread.cpp
index 58daa5d..3aa8054 100644
--- a/game/script/Script_Thread.cpp
+++ b/game/script/Script_Thread.cpp
@@ -795,7 +795,7 @@ void idThread::Error( const char *fmt, ... ) const {
 	vsprintf( text, fmt, argptr );
 	va_end( argptr );
 
-	interpreter.Error( text );
+	interpreter.Error( "%s", text );
 }
 
 /*
@@ -811,7 +811,7 @@ void idThread::Warning( const char *fmt, ... ) const {
 	vsprintf( text, fmt, argptr );
 	va_end( argptr );
 
-	interpreter.Warning( text );
+	interpreter.Warning( "%s", text );
 }
 
 /*
diff --git a/idlib/Parser.cpp b/idlib/Parser.cpp
index 86a57d3..4ef2b50 100644
--- a/idlib/Parser.cpp
+++ b/idlib/Parser.cpp
@@ -326,7 +326,7 @@ void idParser::Error( const char *str, ... ) const {
 	vsprintf(text, str, ap);
 	va_end(ap);
 	if ( idParser::scriptstack ) {
-		idParser::scriptstack->Error( text );
+		idParser::scriptstack->Error( "%s", text );
 	}
 }
 
@@ -343,7 +343,7 @@ void idParser::Warning( const char *str, ... ) const {
 	vsprintf(text, str, ap);
 	va_end(ap);
 	if ( idParser::scriptstack ) {
-		idParser::scriptstack->Warning( text );
+		idParser::scriptstack->Warning( "%s", text );
 	}
 }
 
diff --git a/idlib/math/Simd.cpp b/idlib/math/Simd.cpp
index 7fbad1e..6cbdae1 100644
--- a/idlib/math/Simd.cpp
+++ b/idlib/math/Simd.cpp
@@ -213,7 +213,7 @@ PrintClocks
 void PrintClocks( const char *string, int dataCount, int clocks, int otherClocks = 0 ) {
 	int i;
 
-	idLib::common->Printf( string );
+	idLib::common->Printf( "%s", string );
 	for ( i = idStr::LengthWithoutColors(string); i < 48; i++ ) {
 		idLib::common->Printf(" ");
 	}