{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-53550", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-06-09T18:13:07.263Z", "datePublished": "2026-06-22T14:59:14.906Z", "dateUpdated": "2026-06-22T14:59:14.906Z"}, "containers": {"cna": {"title": "js-yaml: Quadratic-complexity DoS in merge key handling via repeated aliases", "problemTypes": [{"descriptions": [{"cweId": "CWE-407", "lang": "en", "description": "CWE-407: Inefficient Algorithmic Complexity", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "version": "3.1"}}], "references": [{"name": "https://github.com/nodeca/js-yaml/security/advisories/GHSA-h67p-54hq-rp68", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/nodeca/js-yaml/security/advisories/GHSA-h67p-54hq-rp68"}], "affected": [{"vendor": "nodeca", "product": "js-yaml", "versions": [{"version": "< 4.2.0", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-06-22T14:59:14.906Z"}, "descriptions": [{"lang": "en", "value": "js-yaml is a JavaScript YAML parser and dumper. Prior to 4.2.0, a crafted YAML document can trigger algorithmic CPU exhaustion in js-yaml merge-key processing (<<) by repeating the same alias many times in a merge sequence. This causes quadratic parse-time behavior relative to input size and can block a Node.js worker/event loop for seconds with a relatively small payload (tens of KB), resulting in denial of service. The issue is in merge handling inside lib/loader.js. This vulnerability is fixed in 4.2.0."}], "source": {"advisory": "GHSA-h67p-54hq-rp68", "discovery": "UNKNOWN"}}}}

{}

{}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,4.2.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "js-yaml", "source": "cna", "vendor": "nodeca"}, "product": "js-yaml", "vendor": "nodeca"}], "created": "2026-06-22T16:30:08.215291+00:00", "updated": "2026-06-22T17:45:05.265261+00:00", "vendors": ["nodeca", "nodeca$PRODUCT$js-yaml"]}