7-Zip for Windows through 26.02 fails to preserve the Mark-of-the-Web when extracting a crafted RAR5 archive, because its guard that suppresses an archive-supplied Zone.Identifier stream matches the exact name 'Zone.Identifier' while a RAR5 STM record named ':Zone.Identifier:$DATA' is not matched and NTFS canonicalizes it to the same stream, overwriting the propagated Internet-zone marker with ZoneId=0. A second STM record named '::$DATA' overwrites the extracted file's default data stream, letting an attacker defeat SmartScreen/MotW warnings and spoof file content.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| 7 Zip 7 Zip | — | Upgrade 7-Zip to the latest version | Jul 1, 2026 | Jun 28, 2026 |
| Debian | — | Upgrade 7zipUpgrade p7zip | Jul 23, 2026 | Jul 23, 2026 |
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