Is js-yaml 5.4 vulnerable?

npm · 4 releases from 5.4.0 to 5.4.3 · latest js-yaml is 5.5.0 · checked 1 Nov 2026

No known advisories in the last release

js-yaml 5.4.3, the last 5.4 release, has no known advisories. 1 advisory affects earlier 5.4.x releases, so update to 5.4.3.

Update within 5.4:npm install js-yaml@5.4.3

Is your project affected?

Private repo? Upload its lockfile instead, or connect GitHub to check every repo.

Fixed within 5.4.x, affecting earlier releases

  • MediumGHSA-r3ph-w7gj-g6xm29 Sept 2026

    js-yaml: maxTotalMergeKeys does not limit CPU use for empty merge sources

    Affected
    >=5.0.0 <5.4.1
    Fixed in
    5.4.1

Which of your client projects are still on js-yaml 5.4?

NPMscan reads the lockfiles in every GitHub repo you pick, finds the exact js-yaml version each one installs, and checks it against these advisories. Each finding comes with the command that fixes it.

Scan a project free, no signupOr connect GitHub to scan every repo

Other js-yaml versions

Advisory data from OSV.dev (opens OSV.dev in a new tab), which includes the GitHub Advisory Database. Release list from the npm registry. Refreshed daily.