diff --git a/src/dialogxml/dialogs/dialog.cpp b/src/dialogxml/dialogs/dialog.cpp
index db518e71..b58fdc5c 100644
--- a/src/dialogxml/dialogs/dialog.cpp
+++ b/src/dialogxml/dialogs/dialog.cpp
@@ -552,7 +552,8 @@ void cDialog::run(std::function<void(cDialog&)> onopen){
 	win.close();
 #endif
 	win.create(sf::VideoMode(winRect.width(), winRect.height()), "Dialog", sf::Style::Titlebar);
-	win.setPosition({parentPos.x + int(parentSz.x - winRect.width()) / 2, parentPos.y + int(parentSz.y - winRect.height()) / 2});
+	// ASAN overflow
+	win.setPosition({parentPos.x + (int(parentSz.x) - winRect.width()) / 2, parentPos.y + (int(parentSz.y) - winRect.height()) / 2});
 	draw();
 	makeFrontWindow(parent ? parent-> win : mainPtr);
 	makeFrontWindow(win);
diff --git a/src/game/boe.dlgutil.cpp b/src/game/boe.dlgutil.cpp
index a41be617..687eb059 100644
--- a/src/game/boe.dlgutil.cpp
+++ b/src/game/boe.dlgutil.cpp
@@ -548,7 +548,8 @@ void set_up_shop_array() {
 				break;
 		}
 	}
-	shop_sbar->setMaximum(shop_array.size() - 8);
+	// ASAN undefined behaviour
+	shop_sbar->setMaximum(long(shop_array.size()) - 8);
 }
 
 void start_talk_mode(short m_num,short personality,mon_num_t monst_type,short store_face_pic) {
diff --git a/src/game/boe.infodlg.cpp b/src/game/boe.infodlg.cpp
index ba79a8d4..7b7e0890 100644
--- a/src/game/boe.infodlg.cpp
+++ b/src/game/boe.infodlg.cpp
@@ -701,15 +701,25 @@ void cStringRecorder::operator()(cDialog& me) {
 	switch(type) {
 		case NOTE_SCEN:
 			str1 = univ.scenario.spec_strs[label1];
-			str2 = univ.scenario.spec_strs[label2];
+			if (label2>=univ.scenario.spec_strs.size())
+				showError("cStringRecorder(): bad label 2.");
+			else
+				str2 = univ.scenario.spec_strs[label2];
 			break;
 		case NOTE_TOWN:
 			str1 = univ.town->spec_strs[label1];
-			str2 = univ.town->spec_strs[label2];
+			if (label2>=univ.town->spec_strs.size())
+				showError("cStringRecorder(): bad label 2.");
+			else
+				str2 = univ.town->spec_strs[label2];
 			break;
 		case NOTE_OUT:
 			str1 = univ.scenario.outdoors[label1b][label2b]->spec_strs[label1];
-			str2 = univ.scenario.outdoors[label1b][label2b]->spec_strs[label2];
+			// memory problem, ie. called with label=65535(-1)
+			if (label2>=univ.scenario.outdoors[label1b][label2b]->spec_strs.size())
+				showError("cStringRecorder(): bad label 2.");
+			else
+				str2 = univ.scenario.outdoors[label1b][label2b]->spec_strs[label2];
 			break;
 	}
 	if(univ.party.record(type, str1, location))
diff --git a/src/game/boe.items.cpp b/src/game/boe.items.cpp
index 445a06f0..3c9a48f2 100644
--- a/src/game/boe.items.cpp
+++ b/src/game/boe.items.cpp
@@ -387,7 +387,8 @@ static void put_item_graphics(cDialog& me, size_t& first_item_shown, short& curr
 	if(first_item_shown == 0)
 		me["up"].hide();
 	else me["up"].show();
-	if(first_item_shown > item_array.size() - 7 ||
+	// ASAN undefined behaviour, ie. item_array.size can be less than 7
+	if(first_item_shown+7 > item_array.size() ||
 	   item_array.size() <= 8)
 		me["down"].hide();
 	else me["down"].show();
diff --git a/src/scenario/scenario.cpp b/src/scenario/scenario.cpp
index b821bd2c..a202e644 100644
--- a/src/scenario/scenario.cpp
+++ b/src/scenario/scenario.cpp
@@ -66,6 +66,8 @@ cScenario::cScenario() {
 	bg_fight = 4;
 	bg_town = 13;
 	bg_dungeon = 9;
+	// ASAN used but unset
+	is_legacy = false;
 	for(short i = 0; i < town_mods.size(); i++) {
 		town_mods[i].spec = -1;
 	}
diff --git a/src/tools/vector2d.hpp b/src/tools/vector2d.hpp
index f31c865f..6cc4f96f 100644
--- a/src/tools/vector2d.hpp
+++ b/src/tools/vector2d.hpp
@@ -152,7 +152,8 @@ public:
 		size_t old_w = w, old_h = h;
 		w = width; h = height;
 		data.resize(w * h);
-		if(old_w < width) {
+		// ASAN undefined behaviour if old_h==0, y=old_h-1 is ...
+		if(old_w < width && old_h) {
 			size_t dx = width - old_w;
 			for(int y = old_h - 1; y > 0; y--) {
 				std::move_backward(data.begin() + old_w * y, data.begin() + old_w * (y + 1), data.begin() + w * (y + 1) - dx);
diff --git a/src/universe/creature.cpp b/src/universe/creature.cpp
index 01f583d1..d2bc0b07 100644
--- a/src/universe/creature.cpp
+++ b/src/universe/creature.cpp
@@ -20,6 +20,8 @@ const short cCreature::charm_odds[21] = {90,90,85,80,78, 75,73,60,40,30, 20,10,4
 cCreature::cCreature() {
 	attitude = eAttitude::DOCILE;
 	cur_loc.x = cur_loc.y = targ_loc.x = targ_loc.y = 80;
+	// ASAN party_summoned writed but unset
+	party_summoned = false;
 }
 
 cCreature::cCreature(int num) : cCreature() {
diff --git a/src/universe/population.hpp b/src/universe/population.hpp
index 1c2f2bcd..18262fce 100644
--- a/src/universe/population.hpp
+++ b/src/universe/population.hpp
@@ -32,7 +32,8 @@ public:
 	void clear() {dudes.clear();}
 	cCreature& operator[](size_t n);
 	const cCreature& operator[](size_t n) const;
-	cPopulation() : which_town(200) {}
+	// ASAN hostile copied but unset
+	cPopulation() : which_town(200), hostile(false) {}
 	std::vector<cCreature>::iterator begin() {return dudes.begin();}
 	std::vector<cCreature>::iterator end() {return dudes.end();}
 	// Apparently Visual Studio needs this to work