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    CVE-2026-59870

    js-yaml is a JavaScript YAML parser and dumper. Prior to 3.15.1, 4.3.1, and 5.2.1, YAML11_SCHEMA support for the !!omap tag in src/tag/sequence/omap.ts uses omapTag.addItem() to perform a linear duplicate-key scan on every insertion, causing O(n^2) CPU consumption when yaml.load() parses a crafted ordered-map document. In v3 and v4, !!omap is active and exploitable by default. v5 doesn't use !!omap by default, and the chances of activating it are very low.This issue is fixed in 3.15.1, 4.3.1, and 5.2.1.

    Published:Jul 8, 2026
    Last Modified:Oct 6, 2026
    EPS:Jul 8, 2026
    EPSS Score:0.00644
    CVSS Score:7.5

    Affected Products

    Vendor
    Nodeca
    Product
    Js-yaml

    Exploits

    https://github.com/nodeca/js-yaml/security/advisories/GHSA-724g-mxrg-4qvmhttps://github.com/nodeca/js-yaml/security/advisories/GHSA-724g-mxrg-4qvm

    Related CVEs

    CVE-2026-84375 (CVSS 7.5) — js-yaml is a JavaScript YAML parser and dumper. From 3.0.0 until 3.15.2, 4.3.2, and 5.4.1, maxTotalMergeKeys i…
    CVE-2026-73643 (CVSS 7.5) — js-yaml is a JavaScript YAML parser and dumper. From 5.0.0 until 5.2.2, parsing a small YAML document can take…
    CVE-2026-59868 (CVSS 5.3) — js-yaml is a JavaScript YAML parser and dumper. From 5.0.0 before 5.2.0, when merge keys are enabled, js-yaml …
    CVE-2026-59869 (CVSS 7.5) — js-yaml is a JavaScript YAML parser and dumper. From 3.0.0 before 3.15.0 and from 4.0.0 before 4.3.0, js-yaml …
    CVE-2026-53550 (CVSS 5.3) — js-yaml is a JavaScript YAML parser and dumper. Prior to 4.2.0 and 3.15.0, a crafted YAML document can trigger…
    CVE-2025-64718 (CVSS 5.3) — js-yaml is a JavaScript YAML parser and dumper. In js-yaml before 4.1.1 and 3.14.2, it's possible for an attac…
    CVE-2013-4660 (CVSS 6.8) — The JS-YAML module before 2.0.5 for Node.js parses input without properly considering the unsafe !!js/function…

    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