CVE-2026-119602

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    CVE-2026-119602

    Published: 30 Oct 2026Last Modified: 1 Nov 2026

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

    Details: 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.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/119xxx/CVE-2026-119602.json, https://hackmd.io/@haindpwn/libmspack-mszip-uninit-window-info-leak, https://nvd.nist.gov/vuln/detail/CVE-2026-119602, https://www.vulncheck.com/advisories/libmspack-through-0-11alpha-uninitialized-memory-disclosure-via-ms-zip-decompressor-window, https://github.com/kyz/libmspack/issues/60, https://github.com/kyz/libmspack, https://github.com/kyz/libmspack/blob/v0.11alpha/libmspack/mspack/mszipd.c#L264-L276

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    v0.11alpha

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-119602 | CVE-DB