CVE-2026-119602
Deferred Deferred - Pending Action

Heap Memory Leak in libmspack MS-ZIP Decompressor

Publication date: 2026-10-30

Last updated on: 2026-10-30

Assigner: VulnCheck

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.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-10-30
Last Modified
2026-10-30
Generated
2026-10-30
AI Q&A
2026-10-30
EPSS Evaluated
N/A
NVD
CVE-2026-119602
EUVD
EUVD-2026-113939

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
kyz libmspack 0

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-908 The product uses or accesses a resource that has not been initialized.

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

This vulnerability is an uninitialized memory disclosure issue in libmspack through 0.11alpha. It occurs in the MS-ZIP decompressor where attackers can exploit unchecked back-reference distances to leak heap data. By crafting an MS-ZIP CAB file with a back-reference in the first block, the cabd->extract() function writes up to 32 KiB of stale heap memory into the extracted output.

Impact Analysis

This vulnerability could allow attackers to access sensitive data stored in memory, potentially exposing confidential information. If exploited, it may lead to unauthorized data leaks, compromising user privacy or system integrity.

Compliance Impact

This vulnerability could violate data protection regulations like GDPR or HIPAA by enabling unauthorized access to personal or sensitive data. Organizations may face compliance breaches, legal penalties, or reputational damage if exploited.

Mitigation Strategies

Update libmspack to the latest version to patch the uninitialized memory disclosure vulnerability in the MS-ZIP decompressor. Avoid processing untrusted MS-ZIP CAB files until patched.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-119602. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart