Buffer overflow in 7-zip
CVE-2026-48095
7-Zip is a file archiver with a high compression ratio. Versions 26.00 and prior contain a heap buffer overflow vulnerability caused by an under-allocation in the NTFS compressed stream buffer (GetCuSize shift UB), potentially allowing att…
Vulnerability class: Integer Overflow
EPSS: 0.009 (57.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
Affected products
- 7-zip
- Mcmilk 7-zip — versions <= 26.00
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Third Party Advisory)
- security-advisories@github.com (Product, x_refsource_MISC, Release Notes)
Frequently asked questions
- What is CVE-2026-48095?
- CVE-2026-48095 is a high-severity vulnerability in 7-zip, classified under Integer Overflow or Wraparound. CVSS score: 8.8/10. Published 2026-06-05.
- How severe is CVE-2026-48095?
- High severity. CVSS v3 base score is 8.8 out of 10.
- Is CVE-2026-48095 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.