CVE-2026-58052: 7-Zip

Low severity, CVSS 3.3. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• 7-Zip 7-Zip: before 26.03 (fixed in 26.03)

Published 2026-06-28. Last modified 2026-10-07.