fix: https://github.com/NodeBB/NodeBB/pull/8759

src/controllers/uploads.js

@@ -117,6 +117,7 @@ uploadsController.uploadThumb = async function (req, res, next) {
 			throw new Error('[[error:invalid-file]]');
 		}
 		await image.isFileTypeAllowed(uploadedFile.path);
+		await image.checkDimensions(uploadedFile.path);
 		await image.resizeImage({
 			path: uploadedFile.path,
 			width: meta.config.topicThumbSize,

src/topics/thumb.js

@@ -47,6 +47,7 @@ module.exports = function (Topics) {
 
 			await image.isFileTypeAllowed(pathToUpload);
 
+			await image.checkDimensions(pathToUpload);
 			await image.resizeImage({
 				path: pathToUpload,
 				width: meta.config.topicThumbSize,