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    CVE-2026-46690

    unbounded_spsc is an "unbounded" extension of bounded_spsc_queue. In versions 0.2.0 and prior, sender::send pointer-as-value transmute causes OOB read and fake-Arc drop under TX/RX race. At time of publication, there are no publicly available patches.

    Published:Jun 12, 2026
    Last Modified:Jun 16, 2026
    EPS:Jun 12, 2026
    EPSS Score:0.00118
    CVSS Score:5.8

    Affected Products

    Vendor
    Spearman
    Product
    Unbounded-spsc

    Exploits

    https://github.com/spearman/unbounded-spsc/security/advisories/GHSA-6m57-8r3p-pqx6https://github.com/spearman/unbounded-spsc/security/advisories/GHSA-6m57-8r3p-pqx6

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-540 Overread Buffers

    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