Description
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.
Severity (CVSS)
| Base score | 4.8 |
|---|---|
| Severity | Medium |
| Version | CVSS 4.0 |
| Vector | 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 |
| Provided by | CNA |
Weaknesses
- CWE-693 — Protection Mechanism Failure
Affected products
| Vendor | Product | Versions |
|---|---|---|
| 7-Zip | 7-Zip | 0 to <=26.02 |
References
- https://github.com/bikini/exploitarium/tree/main/7zip-rar5-motw-chain-poc (exploit third-party-advisory)
- https://github.com/ip7z/7zip (product)
- https://www.vulncheck.com/advisories/7-zip-mark-of-the-web-bypass-via-rar5-alternate-data-stream-name-collision (third-party-advisory)
Generated from the official CVE List on 28 Jun 2026 07:01 UTC.