Vulnerability · Published Jun 28, 2026 · Assigned by VulnCheck
CVE-2026-580527-Zip - Mark-of-the-Web Bypass via RAR5 Alternate Data Stream Name Collision
Low 3.3
In plain English
A low-severity security flaw in 7-Zip from 7-Zip. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | 7zip | no fix listed | DEBIAN-CVE-2026-58052 |
| Debian:13 | 7zip | no fix listed | DEBIAN-CVE-2026-58052 |
| Debian:14 | 7zip | 26.03+dfsg-1 | DEBIAN-CVE-2026-58052 |
| Debian:12 | p7zip | no fix listed | DEBIAN-CVE-2026-58052 |
| Debian:13 | p7zip | 16.02+transitional.1 | DEBIAN-CVE-2026-58052 |
Affected products (as reported)
Weakness: CWE-693 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
References
- Proof of Concept exploit, third-party-advisory
- 7-Zip source (ip7z/7zip) product
- VulnCheck Advisory: 7-Zip - Mark-of-the-Web Bypass via RAR5 Alternate Data Stream Name Collision third-party-advisory