GHSA-68fv-2mgg-jv7q

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    GHSA-68fv-2mgg-jv7q

    Published: 18 Sept 2026Last Modified: 5 Oct 2026

    Summary: source-map-js allows event-loop denial of service through indexed source-map section offsets

    Details: source-map-js through 1.2.1 fails to validate the per-section offset line value in indexed source maps, allowing attackers to specify arbitrary numeric values. Attackers can supply extremely large offset line values that cause synchronous event loop blocking for extended periods, preventing the service from handling other requests.

    References: https://nvd.nist.gov/vuln/detail/CVE-2026-93749, https://github.com/7rulnik/source-map-js/issues/76, https://github.com/7rulnik/source-map-js/pull/79, https://github.com/7rulnik/source-map-js/commit/cf7658058ceeaa8619d5ae0ec90be6905209d016, https://github.com/7rulnik/source-map-js, https://github.com/7rulnik/source-map-js/blob/c1cd8904bb7bd0c7fb5879fcda48134d82a27934/lib/source-node.js#L115-L118, https://github.com/7rulnik/source-map-js/releases/tag/v1.2.2, https://www.vulncheck.com/advisories/source-map-js-through-1.2.1-event-loop-denial-of-service

    Affected packages

    Package

    Name: source-map-js

    Purl: pkg:npm/source-map-js

    Affected ranges

    Type: SEMVER

    Events:

    Introduced- 1.0.0
    Fixed -1.2.2

    Affected versions

    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
    GHSA-68fv-2mgg-jv7q | CVE-DB