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    CVE-2026-54522

    MessagePack for Ruby is an implementation of the MessagePack binary serialization format. Prior to 1.8.2, MessagePack::Buffer#clear in ext/msgpack/buffer.c leaves rmem_last, rmem_end, and rmem_owner stale after _msgpack_buffer_shift_chunk returns an rmem page to the shared pool, allowing a subsequent Buffer#write and a second MessagePack::Buffer to alias the page and disclose or corrupt cross-buffer data. This issue is fixed in version 1.8.2.

    Published:Jul 30, 2026
    Last Modified:Jul 30, 2026
    EPS:Jul 30, 2026
    EPSS Score:
    CVSS Score:2.1

    Affected Products

    Vendor
    Msgpack
    Product
    Msgpack

    Exploits

    https://github.com/msgpack/msgpack-ruby/security/advisories/GHSA-4mrv-5p47-p938https://github.com/msgpack/msgpack-ruby/security/advisories/GHSA-4mrv-5p47-p938

    Common Weakness Enumeration

    CWE-416 Use After Free

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    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