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    2 vulnerabilities found for msgpack-ruby by msgpack

    CVE-2026-54522 (GCVE-0-2026-54522)

    Vulnerability from nvd – Published: 2026-07-30 16:33 – Updated: 2026-07-30 17:39
    VLAI
    Title
    MessagePack::Buffer#clear Use-After-Free that Enables Cross-Buffer Disclosure
    Summary
    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.
    Severity
    2.1 (Low)
    CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
    SSVC
    Exploitation: poc Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    Assigner
    References
    Impacted products
    Vendor Product Version
    msgpack msgpack-ruby Affected: < 1.8.2
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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        "title": "CISA ADP Vulnrichment"
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    CVE-2026-54522 (GCVE-0-2026-54522)

    Vulnerability from cvelistv5 – Published: 2026-07-30 16:33 – Updated: 2026-07-30 17:39
    VLAI
    Title
    MessagePack::Buffer#clear Use-After-Free that Enables Cross-Buffer Disclosure
    Summary
    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.
    Severity
    2.1 (Low)
    CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
    SSVC
    Exploitation: poc Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    Assigner
    References
    Impacted products
    Vendor Product Version
    msgpack msgpack-ruby Affected: < 1.8.2
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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