AIKIDO-2026-543038
js-yaml is vulnerable to Denial of Service (DoS)
53
Medium Risk
This Affects:
js-yamlTL;DR
Affected versions of this package are vulnerable to Denial of Service (DoS) because the maxTotalMergeKeys safeguard does not account for empty mappings during merge processing. A crafted YAML document that repeatedly merges empty mappings performs a large number of iterations without ever incrementing the merge-key counter, so the configured limit is never reached. The fix counts each merge-source mapping toward maxTotalMergeKeys and hard-limits the size of merge sequences.
Who does this affect?
You are affected if your application uses an affected version to parse untrusted YAML input.
Background info
js-yaml is vulnerable to Denial of Service (DoS) in versions 5.0.0 - 5.4.0.
How to fix this
Upgrade the js-yaml library to the patch version.
Are You Affected?
Connect your repositories to instantly see whether vulnerable or malicious packages exist in your codebase.
Free. No credit card required.
I consent to receiving marketing communications based on Aikido’s Privacy Policy.
SOC 2Compliant
ISO 27001CompliantISO 42001Compliant
FedRAMPImplementing© All Intel data is openly available and commercially licensed.