CVE-2026-119602

libmspack through 0.11alpha Uninitialized Memory Disclosure via MS-ZIP Decompressor Window

Published Oct 30, 2026 CVSS 4.0 · 6.3 Medium EPSS < 1% KEV · Not listed
Description
libmspack through 0.11alpha contains an uninitialized memory disclosure vulnerability in the MS-ZIP decompressor that allows attackers to leak heap data via unchecked back-reference distances. Attackers can supply a crafted MS-ZIP CAB file whose first block begins with a back-reference, causing cabd->extract() to write up to 32 KiB of stale heap memory into extracted output.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Kyzer
Kyzer libmspack
Vendors & Products Kyzer
Kyzer libmspack
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description libmspack through 0.11alpha contains an uninitialized memory disclosure vulnerability in the MS-ZIP decompressor that allows attackers to leak heap data via unchecked back-reference distances. Attackers can supply a crafted MS-ZIP CAB file whose first block begins with a back-reference, causing cabd->extract() to write up to 32 KiB of stale heap memory into extracted output.
Title libmspack through 0.11alpha Uninitialized Memory Disclosure via MS-ZIP Decompressor Window
First Time appeared Libmspack Project
Libmspack Project libmspack
Weaknesses CWE-908
CPEs cpe:2.3:a:libmspack_project:libmspack:*:*:*:*:*:*:*:*
Vendors & Products Libmspack Project
Libmspack Project libmspack
References
Metrics cvssV3_1

{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N'}

cvssV4_0

{'score': 6.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Oct 30, 2026, 3:53 PM
Reserved
Oct 30, 2026, 11:46 AM
Status
Deferred
Published
Oct 30, 2026, 2:16 PM
Modified
Oct 30, 2026, 4:17 PM
Severity
Low
Public date
Oct 30, 2026, 1:18 PM