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CVE-2026-119602medium6.3

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

Impact

libmspack through 0.11alpha has an uninitialized memory disclosure vulnerability in the MS-ZIP decompressor, allowing attackers to leak heap data via crafted MS-ZIP CAB files. Attackers need to supply a specially crafted file to exploit this weakness. The impact is the disclosure of stale heap memory.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

Affected packages

This source has no supported package-version data for matching. You can read the advisory here, but this record alone cannot power a dependency check.

Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

kyz · VulnCheck

libmspack

1 range
VulnCheck version evidence

Package identity

pkg:github/kyz/libmspack

Identity supplied by VulnCheck. Version matching requires compatible range evidence.

Compare with this publisher’s ranges. This does not inspect your installation.

affected

0 → through 0.11alpha

custom versions

unaffected

unknown

Other versions: unaffected

Original source 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.

Inside the record

Evidence available

Package identity
Version evidence
Remediation guidance · not supplied
Weakness classification
Additional publishers

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-119602

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-908 ↗

Use of Uninitialized Resource

VulnCheck

Related →

Environment requirements

These conditions apply together as specified by the publisher. A matching product name alone does not establish exposure.

VulnCheck · platform conditions

Any condition may hold

Vulnerable product

cpe:2.3:a:libmspack_project:libmspack:*:*:*:*:*:*:*:*

Through (inclusive): 0.11alpha

Original applicability statements
[
  {
    "nodes": [
      {
        "operator": "OR",
        "negate": false,
        "cpeMatch": [
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:a:libmspack_project:libmspack:*:*:*:*:*:*:*:*",
            "versionEndIncluding": "0.11alpha"
          }
        ]
      }
    ]
  }
]
Contributing organizations · 2
VulnCheck

Assigning organization

2026-10-30
CISA-ADP

Additional data publisher

2026-10-30

What changed

Follow changes
  1. CVE · CVE-2026-119602

    Observed 2026-10-30T15:58:43.204Z · upstream updated 2026-10-30T15:53:29.159Z

    Prioritization updated

    before

    []

    after

    [
  {
    "source": "CISA-ADP",
    "type": "SSVC",
    "role": "CISA Coordinator",
    "timestamp": "2026-10-30T15:21:16.087677Z",
    "decisions": [
      {
        "name": "Exploitation",
        "value": "none"
      },
      {
        "name": "Automatable",
        "value": "no"
      },
      {
        "name": "Technical Impact",
        "value": "partial"
      }
    ]
  }
]

Large field values are marked as truncated previews. Original source snapshots remain retained.

Showing up to 50 most recent observed changes.

References

5 sources
github.com/kyz/libmspack/issues/60
issue-trackingVulnCheck
github.com/kyz/libmspack/blob/v0.11alpha/libmspack/mspack/mszipd.c
technical-descriptionVulnCheck
hackmd.io/@haindpwn/libmspack-mszip-uninit-window-info-leak
third-party-advisoryVulnCheck
github.com/kyz/libmspack
productVulnCheck
www.vulncheck.com/advisories/libmspack-through-0-11alpha-uninitialized-memory-disclosure-via-ms-zip-decompressor-window
third-party-advisoryVulnCheck