CVE-2026-58052

Name of the Vulnerable Software and Affected Versions 7-Zip for Windows versions prior to 26.02

Description 7-Zip fails to preserve the Mark-of-the-Web (MotW) when extracting a specially crafted RAR5 archive. The software uses a guard to suppress archive-supplied Zone.Identifier streams, but it only matches the exact name Zone.Identifier. An attacker can use a RAR5 STM (Stream Extension) record named :Zone.Identifier:$DATA, which NTFS canonicalizes to the same stream, effectively overwriting the Internet-zone marker with ZoneId=0. Additionally, a second STM record named ::$DATA can overwrite the extracted file's default data stream. This allows an attacker to bypass SmartScreen and MotW warnings and spoof file content.

Recommendations Update 7-Zip for Windows to a version newer than 26.02.