CVE-2026-58052
7-Zip - Mark-of-the-Web Bypass via RAR5 Alternate Data Stream Name Collision
- State
- Published
- Severity
- 4.8 Medium
- Published
- Jun 28, 2026
- Updated
- Jul 14, 2026
- Reserved
- Jun 28, 2026
Description
7-Zip for Windows through 26.01 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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 4.8 Medium | CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 3.3 Low | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N | VulnCheck |
Weaknesses
- CWE-693 Protection Mechanism Failure
Affected Products
| Product | Versions |
|---|---|
7-Zip7-Zip |
|
References
- Proof of Conceptexploitthird-party-advisory
- 7-Zip source (ip7z/7zip)product
- VulnCheck Advisory: 7-Zip - Mark-of-the-Web Bypass via RAR5 Alternate Data Stream Name Collisionthird-party-advisory
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