@@ -0,0 +1,5 @@
+---
+"webpack": patch
+---
+
+Reject a second `srcset` descriptor after a `0x` density descriptor.
@@ -14920,7 +14920,7 @@ const parseSrcset = (input) => {
 				lastChar === SMALL_LETTER_W
 			) {
 				// If width and density are not both absent, then let error be yes.
-				if (width || density) {
+				if (width !== undefined || density !== undefined) {
 					pError = true;
 				}
 
@@ -14943,7 +14943,11 @@ const parseSrcset = (input) => {
 			) {
 				// If width, density and future-compat-h are not all absent, then let error
 				// be yes.
-				if (width || density || height) {
+				if (
+					width !== undefined ||
+					density !== undefined ||
+					height !== undefined
+				) {
 					pError = true;
 				}
 
@@ -14965,7 +14969,7 @@ const parseSrcset = (input) => {
 				lastChar === SMALL_LETTER_H
 			) {
 				// If height and density are not both absent, then let error be yes.
-				if (height || density) {
+				if (height !== undefined || density !== undefined) {
 					pError = true;
 				}
 
 
@@ -9357,6 +9357,19 @@ describe("parseSrcset", () => {
 		expect(() => parseSrcset("a.png -1x")).toThrow(/Invalid srcset descriptor/);
 	});
 
+	it("should throw on a descriptor after a zero density descriptor", () => {
+		expect(parseSrcset("a.png 0x")).toEqual([["a.png", 0, 5]]);
+		expect(() => parseSrcset("a.png 0x 1x")).toThrow(
+			/Invalid srcset descriptor/
+		);
+		expect(() => parseSrcset("a.png 0x 1w")).toThrow(
+			/Invalid srcset descriptor/
+		);
+		expect(() => parseSrcset("a.png 0x 1h")).toThrow(
+			/Invalid srcset descriptor/
+		);
+	});
+
 	it("should throw on conflicting descriptors", () => {
 		expect(() => parseSrcset("a.png 480w 2x")).toThrow(
 			/Invalid srcset descriptor/
-Original file line number
+Diff line change
@@ @@ -0,0 +1,5 @@ @@
 +---
 +"webpack": patch
 +---
++
 +Reject a second `srcset` descriptor after a `0x` density descriptor.