CVE-2026-58052
7-Zip - Mark-of-the-Web Bypass via RAR5 Alternate Data Stream Name Collision
CVSS Score
3.3
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-693 |
| Vendor | 7-zip |
| Product | 7-zip |
| Published | Jun 28, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None
Affected Versions
7-Zip / 7-Zip
0 ≤ 26.02
References
Credits
ashdfrkl