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    CVE-2026-25587

    SandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, as Map is in SAFE_PROTOYPES, it's prototype can be obtained via Map.prototype. By overwriting Map.prototype.has the sandbox can be escaped. This vulnerability is fixed in 0.8.29.

    Published:Feb 6, 2026
    Last Modified:Apr 17, 2026
    EPS:Feb 6, 2026
    EPSS Score:0.00034
    CVSS Score:10

    Affected Products

    Vendor
    Nyariv
    Product
    Sandboxjs

    Exploits

    https://github.com/nyariv/SandboxJS/security/advisories/GHSA-66h4-qj4x-38xphttps://github.com/nyariv/SandboxJS/security/advisories/GHSA-66h4-qj4x-38xp

    Related CVEs

    CVE-2026-43898 (CVSS 10) — SandboxJS is a JavaScript sandboxing library. Prior to 0.9.6, sandbox-defined functions expose Function.caller…
    CVE-2026-34217 (CVSS 6.9) — SandboxJS is a JavaScript sandboxing library. Prior to 0.8.36, a scope modification vulnerability exists in @n…
    CVE-2026-34211 (CVSS 6.9) — SandboxJS is a JavaScript sandboxing library. Prior to 0.8.36, the @nyariv/sandboxjs parser contains unbounded…
    CVE-2026-34208 (CVSS 10) — SandboxJS is a JavaScript sandboxing library. Prior to 0.8.36, SandboxJS blocks direct assignment to global ob…
    CVE-2026-32723 (CVSS 4.8) — SandboxJS is a JavaScript sandboxing library. Prior to 0.8.35, SandboxJS timers have an execution-quota bypass…
    CVE-2026-26954 (CVSS 10) — SandboxJS is a JavaScript sandboxing library. Prior to 0.8.34, it is possible to obtain arrays containing Func…
    CVE-2026-25881 (CVSS 9) — SandboxJS is a JavaScript sandboxing library. Prior to 0.8.31, a sandbox escape vulnerability allows sandboxed…
    CVE-2026-25586 (CVSS 10) — SandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, a sandbox escape is possible by shadowing hasOw…
    CVE-2026-25520 (CVSS 10) — SandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, The return values of functions aren't wrapped. …
    CVE-2026-25641 (CVSS 10) — SandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, there is a sandbox escape vulnerability due to …

    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