Infinite.zip

The ZIP algorithm can compress repetitive data (like a file filled entirely with zeros) extremely efficiently. A 10 GB file of zeros can be compressed into a few megabytes.

When an antivirus scanner or user unzips the file, the decompression engine attempts to expand every layer, leading to an exponential increase in disk space usage. 3. Purpose and Impact

It relies on recursive compression —layers upon layers of nested ZIP files. A single file might contain 100 zip files, each containing 100 more, and so on. 2. How it Works (The Mechanics) Infinite.zip

Systems should be configured to reject archives where the ratio of compressed-to-uncompressed size is suspiciously high.

The most infamous example, 42.zip , is a 42-kilobyte file that, when fully extracted, expands to 4.5 petabytes ( The ZIP algorithm can compress repetitive data (like

Modern antivirus software and archiving tools (like 7-Zip) often limit the number of nested levels they will scan or extract to avoid this type of attack.

Do not extract unknown or unexpectedly small zip files from untrusted sources. zip and recursive zip bombs ? 42.zip (2004) - Hacker News What is it?

Here is a deep report on its mechanics, purpose, and mitigation: 1. What is it?