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    CVE-2026-25521

    Locutus brings stdlibs of other programming languages to JavaScript for educational purposes. In versions from 2.0.12 to before 2.0.39, a prototype pollution vulnerability exists in locutus. Despite a previous fix that attempted to mitigate prototype pollution by checking whether user input contained a forbidden key, it is still possible to pollute Object.prototype via a crafted input using String.prototype. This issue has been patched in version 2.0.39.

    Published:Feb 4, 2026
    Last Modified:Apr 17, 2026
    EPS:Feb 4, 2026
    EPSS Score:0.0001
    CVSS Score:8.8

    Affected Products

    Vendor
    Locutus
    Product
    Locutus

    Exploits

    https://github.com/locutusjs/locutus/security/advisories/GHSA-rxrv-835q-v5mh

    Related CVEs

    CVE-2026-33994 (CVSS 6.3) — Locutus brings stdlibs of other programming languages to JavaScript for educational purposes. Starting in vers…
    CVE-2026-33993 (CVSS 6.9) — Locutus brings stdlibs of other programming languages to JavaScript for educational purposes. Prior to version…
    CVE-2026-32304 (CVSS 9.8) — Locutus brings stdlibs of other programming languages to JavaScript for educational purposes. Prior to 3.0.14,…
    CVE-2026-29091 (CVSS 8.1) — Locutus brings stdlibs of other programming languages to JavaScript for educational purposes. Prior to version…
    CVE-2021-23392 (CVSS 5.3) — The package locutus before 2.0.15 are vulnerable to Regular Expression Denial of Service (ReDoS) via the gophe…
    CVE-2020-7719 (CVSS 9.8) — Versions of package locutus before 2.0.12 are vulnerable to prototype Pollution via the php.strings.parse_str …

    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