From f8cd66727cda7c0e58289ca0eaf9158b32b0dbfa Mon Sep 17 00:00:00 2001
From: JonnyBurger <jonathanburger11@gmail.com>
Date: Sat, 18 Oct 2025 11:23:44 +0200
Subject: [PATCH] Make Mediabunny more resilient against `data` boxes ending
 abruptly

---
 src/isobmff/isobmff-reader.ts | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/isobmff/isobmff-reader.ts b/src/isobmff/isobmff-reader.ts
index f3090a1..ddb6f94 100644
--- a/src/isobmff/isobmff-reader.ts
+++ b/src/isobmff/isobmff-reader.ts
@@ -70,6 +70,10 @@ export const readDataBox = (slice: FileSlice) => {
 		return null;
 	}
 
+	if (slice.remainingLength < 4) {
+		return null;
+	}
+
 	const typeIndicator = readU32Be(slice);
 	slice.skip(4); // Locale indicator
 	const data = readBytes(slice, header.contentSize - 8);