{"id":"CVE-2026-84375","revision":"521f69620c07484ca0eb001c3107e342","records":[{"revision":"521f69620c07484ca0eb001c3107e342","observedAt":"2026-10-25T16:19:16.24+00:00","statement":{"source":"nvd","id":"CVE-2026-84375","aliases":[],"title":"js-yaml is a JavaScript YAML parser and dumper. From 3.0.0 until 3.15.2, 4.3.2, and 5.4.1, maxTotalMergeKeys in lib/js-yaml/loader.js and lib/loader.js does not count empty mapping sources while processing the merge key <<. An attacker can …","description":"js-yaml is a JavaScript YAML parser and dumper. From 3.0.0 until 3.15.2, 4.3.2, and 5.4.1, maxTotalMergeKeys in lib/js-yaml/loader.js and lib/loader.js does not count empty mapping sources while processing the merge key <<. An attacker can alias a large sequence of empty mappings into many merge targets, causing O(N * K) processing while totalMergeKeys remains unchanged and the configured resource limit is never reached. A relatively small YAML document can therefore cause prolonged CPU consumption in applications that parse untrusted YAML, and merge processing is enabled by default on these release lines. In v3 & v4, merge is enabled by default so the severity score is higher. This issue is fixed in versions 3.15.2, 4.3.2, and 5.4.1.","state":0,"publishedAt":"2026-09-01T22:17:19.44+00:00","modifiedAt":"2026-09-28T22:17:33.377+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://github.com/nodeca/js-yaml/commit/3485bc06ff8a0251505f44a00414d90df2466639","https://github.com/nodeca/js-yaml/commit/6a8e05f9a485188ed730ac81e81ae221352ef480","https://github.com/nodeca/js-yaml/commit/d90b6612a5a84385bdcb556c44578eac76dc0f6b","https://github.com/nodeca/js-yaml/pull/797","https://github.com/nodeca/js-yaml/releases/tag/3.15.2","https://github.com/nodeca/js-yaml/releases/tag/4.3.2","https://github.com/nodeca/js-yaml/releases/tag/5.4.1","https://github.com/nodeca/js-yaml/security/advisories/GHSA-2883-xcg3-v3hh"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-84375","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-400","CWE-407"],"productCriteria":[],"sourceDates":{"published":"2026-09-01T22:17:19.440","lastModified":"2026-09-28T22:17:33.377"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-84375","identifiers":["CVE-2026-84375"]},"retained":false,"historicalAffected":[]}],"coverage":[]}