Is js-yaml affected by CVE-2026-53550?

npm js-yaml is affected in <4.2.0.

Is CVE-2026-53550 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.4%.

medium

CVE-2026-53550

Q: Is CVE-2026-53550 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.4%.

npm · js-yaml

Summary

JS-YAML: Quadratic-complexity DoS in merge key handling via repeated aliases

Severity: medium
EPSS: 0.4% (p32)
Also known as: GHSA-h67p-54hq-rp68
Published: 2026-06-15

References

https://github.com/nodeca/js-yaml/security/advisories/GHSA-h67p-54hq-rp68
https://github.com/nodeca/js-yaml

Related advisories

CVE-2026-84375 — high · npm/js-yaml
GHSA-5p4m-2wfm-xmqj — high · npm/js-yaml
GHSA-pm4m-ph32-ghv5 — high · npm/js-yaml
CVE-2026-59869 — high · npm/js-yaml
CVE-2026-59868 — medium · npm/js-yaml
CVE-2026-59870 — medium · npm/js-yaml

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Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.