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    CVE-2026-107300

    msgpack5 is a msgpack v5 implementation for node.js and the browser. Prior to 6.1.0, the streaming decoder recursively invokes itself for each complete MessagePack value remaining in a chunk. A remote peer can send one chunk containing many small valid values, causing recursion proportional to the value count, exhausting the JavaScript call stack, and interrupting the process or stream. This issue is fixed in version 6.1.0.

    Published:Oct 8, 2026
    Last Modified:Oct 9, 2026
    EPS:Oct 8, 2026
    EPSS Score:
    CVSS Score:7.5

    Affected Products

    Vendor
    Mcollina
    Product
    Msgpack5

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-674 Uncontrolled Recursion

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-230 Serialized Data with Nested Payloads
    CAPEC-231 Oversized Serialized Data Payloads

    Related CVEs

    CVE-2026-107302 (CVSS 7.5) — msgpack5 is a msgpack v5 implementation for node.js and the browser. Prior to 6.1.0, the decoder reads the fou…
    CVE-2026-107301 (CVSS 6.5) — msgpack5 is a msgpack v5 implementation for node.js and the browser. Prior to 6.1.0, constructing msgpack5 wit…
    CVE-2026-107299 (CVSS 5.9) — msgpack5 is a msgpack v5 implementation for node.js and the browser. Prior to 6.1.0, the streaming decoder tre…
    CVE-2026-107298 (CVSS 5.3) — msgpack5 is a msgpack v5 implementation for node.js and the browser. Prior to 6.1.0, the array and map decodin…
    CVE-2026-107297 (CVSS 5.9) — msgpack5 is a msgpack v5 implementation for node.js and the browser. Prior to 6.1.0, the streaming decoder rep…
    CVE-2026-107296 (CVSS 3.7) — msgpack5 is a msgpack v5 implementation for node.js and the browser. Prior to 6.1.0, decoding a negative signe…

    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