Important context added by the one who found the vulnerability here[1]. A key factor seems to be 7-Zip doesn't just consider file extensions when determining i

Important context added by the one who found the vulnerability here[1]. A key factor seems to be 7-Zip doesn't just consider file extensions when determining if a file is an archive: Now the interesting thing is 7-ZIP will not only look at the file extension BUT the files magic bytes "\x37\x7A\xBC\xAF \x27 \x1C" in the header. Recognizing the 7-Zip magic bytes, 7-Zip will then proceed to process this file as an archive, the contents of which will not receive mark-of-the-web protections due to CVE-2025-0411. [1]: https://arstechnica.com/civis/threads/7-zip-0-day-was-exploited-in-russia%E2%80%99s-ongoing-invasion-of-ukraine.1505501/#post-43492028 https://arstechnica.com/civis/threads/7-zip-0-day-was-exploi...