Out-of-bounds Read in 7-zip
CVE-2026-48103
7-Zip is a file archiver with a high compression ratio. Versions 9.34 through 26.00 contain an off-by-one heap out-of-bounds read in the WIM (Windows Imaging) archive handler's security descriptor lookup. In CHandler::GetSecurity (CPP/7zip…
Vulnerability class: Buffer Overflow
EPSS: 0.002 (13.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L.
Affected products
- 7-zip
- Mcmilk 7-zip — versions >= 9.34, < 26.01
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2026-48103?
- CVE-2026-48103 is a medium-severity vulnerability in 7-zip, classified under Out-of-bounds Read. CVSS score: 4.3/10. Published 2026-06-05.
- How severe is CVE-2026-48103?
- Medium severity. CVSS v3 base score is 4.3 out of 10.