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    CVE-2026-23519

    RustCrypto CMOV provides conditional move CPU intrinsics which are guaranteed on major platforms to execute in constant-time and not be rewritten as branches by the compiler. Prior to 0.4.4, the thumbv6m-none-eabi (Cortex M0, M0+ and M1) compiler emits non-constant time assembly when using cmovnz (portable version). This vulnerability is fixed in 0.4.4.

    Published:Jan 15, 2026
    Last Modified:Apr 18, 2026
    EPS:Jan 15, 2026
    EPSS Score:0.00031
    CVSS Score:9.8

    Affected Products

    Vendor
    Rustcrypto
    Product
    Cmov
    Vendor
    Rustcrypto
    Product
    Utils

    Exploits

    https://github.com/RustCrypto/utils/security/advisories/GHSA-2gqc-6j2q-83qphttps://github.com/RustCrypto/utils/security/advisories/GHSA-2gqc-6j2q-83qp

    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