What is CVE-2026-48101?

CVE-2026-48101 is a medium-severity vulnerability in 7-zip, classified under Use of Uninitialized Resource. CVSS score: 6.5/10. Published 2026-06-05.

How severe is CVE-2026-48101?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in 7-zip

CVE-2026-48101

7-Zip is a file archiver with a high compression ratio. Versions 9.21 through 26.00 contain an An uninitialized memory disclosure vulnerability in the UEFI capsule (.scap) parser in 7-Zip. The OpenCapsule function allocates a heap buffer o…

EPSS: 0.003 (19.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.

Affected products

7-zip
Mcmilk 7-zip — versions >= 9.21, < 26.01

Weakness classification (CWE)

CWE-908 — Use of Uninitialized Resource

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2026-48101?: CVE-2026-48101 is a medium-severity vulnerability in 7-zip, classified under Use of Uninitialized Resource. CVSS score: 6.5/10. Published 2026-06-05.
How severe is CVE-2026-48101?: Medium severity. CVSS v3 base score is 6.5 out of 10.