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CVE-2026-104086

6.8 medium SSVC exploitation: none Published
NVD · CVE.org

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.

Fix

Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.

Change history 3

  1. StatusAwaiting Analysis → PublishedNVD modified 2026-10-19 19:06
  2. StatusReceived → Awaiting AnalysisNVD modified 2026-10-16 19:15
  3. First seenCVSS 6.8NVD modified 2026-10-14 14:17

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 3