Vulnerability in 7-Zip
CVE-2026-58052
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.3 (Low). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (5.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 6th percentile — 5.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- 7-Zip — versions 0
Weakness classification (CWE)
References
- github.com/bikini/exploitarium/tree/main/7zip-rar5-motw-chain-poc (exploit, Broken Link, third-party-advisory)
- github.com/ip7z/7zip (Product, product)
- www.vulncheck.com/advisories/7-zip-mark-of-the-web-bypass-via-rar5-alternate-da… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-58052?
- CVE-2026-58052 is a low-severity vulnerability in 7-Zip, classified under Protection Mechanism Failure. CVSS score: 3.3/10. Published 2026-06-28.
- How severe is CVE-2026-58052?
- Low severity. CVSS v3 base score is 3.3 out of 10.