Use of Uninitialized Resource Affecting 7zip package, versions *


Severity

Recommended
low

Based on Debian security rating.

Threat Intelligence

EPSS
0.19% (8th percentile)

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  • Snyk IDSNYK-DEBIAN12-7ZIP-21176334
  • published18 Oct 2026
  • disclosed14 Oct 2026

Introduced: 14 Oct 2026

NewCVE-2026-104086  (opens in a new tab)
CWE-908  (opens in a new tab)

How to fix?

There is no fixed version for Debian:12 7zip.

NVD Description

Note: Versions mentioned in the description apply only to the upstream 7zip package and not the 7zip package as distributed by Debian. See How to fix? for Debian:12 relevant fixed versions and status.

7-Zip before 26.03 contains an uninitialized memory disclosure vulnerability in the SquashFS v4 archive handler (SquashfsHandler.cpp) that allows attackers to leak heap memory by crafting a malicious archive where the superblock’s no_ids field is set so that the final metadata block’s expected size is miscomputed and bypasses the size validation check. By listing or extracting the crafted archive, attackers can cause the application to return uninitialized heap memory as the kpidUserId and kpidGroupId properties, exposing potentially sensitive process memory contents to the user.

CVSS Base Scores

version 3.1