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    CVE-2026-59869

    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 can spend quadratic CPU time parsing a document whose size grows only linearly when a chain of mappings uses merge keys where each mapping merges the previous one. This issue is fixed in versions 3.15.0 and 4.3.0.

    Published:Jul 8, 2026
    Last Modified:Jul 14, 2026
    EPS:Jul 8, 2026
    EPSS Score:0.0037
    CVSS Score:7.5

    Affected Products

    Vendor
    Nodeca
    Product
    Js-yaml
    Vendor
    Redhat
    Product
    Hummingbird

    Exploits

    https://github.com/nodeca/js-yaml/security/advisories/GHSA-52cp-r559-cp3mhttps://github.com/nodeca/js-yaml/security/advisories/GHSA-52cp-r559-cp3m

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    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 and 4.3.2, maxTotalMergeKeys in lib/js…
    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-2026-59870 (CVSS 5.3) — js-yaml is a JavaScript YAML parser and dumper. From 5.0.0 before 5.2.1, YAML11_SCHEMA support for the !!omap …
    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