Vulnerability · NVD

CVE-2026-48101

MEDIUM 6.5 Published on 2026-06-05

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 of attacker-declared CapsuleImageSize (up to 1 GiB) without zero-initialization, then reads the file contents into it with ReadStream_FALSE whose return value is silently discarded. If the file is truncated, the unread tail of the buffer retains uninitialized heap memory, which is then exposed as extracted file content via GetStream. Version 26.0.1 fixes the issue.

Attack vector : Network No privileges required

Show raw CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

EPSS 0.03% exploit very unlikely percentile 9.3%

Tracked apps referencing this CVE

For each app: the affected range, the fixing version, and where the tracked app stands today.

7-Zip Windows winget:7zip.7zip

Affected ≥9.21 ≤26.01 Fixed in 26.01+ Latest tracked 26.01 still vulnerable

Observed affected builds (14)

26.01 26.00 25.01 25.00 24.09 24.08 24.07 24.06 24.05 23.01 22.01 19.00 19.00.00.0 16.04

Vulnerable CPE configurations (1)

Vendor	Product	Platform	Versions	CPE 2.3 URI
7-zip	7-zip All platforms (wildcard)	All platforms (wildcard)	≥9.21 ≤26.01	cpe:2.3:a:7-zip:7-zip::::::::

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