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    CVE-2026-1979

    A flaw has been found in mruby up to 3.4.0. This affects the function mrb_vm_exec of the file src/vm.c of the component JMPNOT-to-JMPIF Optimization. Executing a manipulation can lead to use after free. The attack needs to be launched locally. The exploit has been published and may be used. This patch is called e50f15c1c6e131fa7934355eb02b8173b13df415. It is advisable to implement a patch to correct this issue.

    Published:Feb 6, 2026
    Last Modified:Apr 18, 2026
    EPS:Feb 6, 2026
    EPSS Score:0.00027
    CVSS Score:5.3

    Affected Products

    Vendor
    Mruby
    Product
    Mruby

    Exploits

    https://github.com/mruby/mruby/issues/6701https://github.com/mruby/mruby/issues/6701#issue-3802609843

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    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