{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-84375","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-09-01T16:27:58.129Z","datePublished":"2026-09-01T21:43:13.617Z","dateUpdated":"2026-09-28T21:32:39.387Z"},"containers":{"cna":{"title":"js-yaml: maxTotalMergeKeys does not limit CPU use for empty merge sources","problemTypes":[{"descriptions":[{"cweId":"CWE-400","lang":"en","description":"CWE-400: Uncontrolled Resource Consumption","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-407","lang":"en","description":"CWE-407: Inefficient Algorithmic Complexity","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","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:H","version":"3.1"}}],"references":[{"name":"https://github.com/nodeca/js-yaml/security/advisories/GHSA-2883-xcg3-v3hh","tags":["x_refsource_CONFIRM"],"url":"https://github.com/nodeca/js-yaml/security/advisories/GHSA-2883-xcg3-v3hh"},{"name":"https://github.com/nodeca/js-yaml/pull/797","tags":["x_refsource_MISC"],"url":"https://github.com/nodeca/js-yaml/pull/797"},{"name":"https://github.com/nodeca/js-yaml/commit/3485bc06ff8a0251505f44a00414d90df2466639","tags":["x_refsource_MISC"],"url":"https://github.com/nodeca/js-yaml/commit/3485bc06ff8a0251505f44a00414d90df2466639"},{"name":"https://github.com/nodeca/js-yaml/commit/6a8e05f9a485188ed730ac81e81ae221352ef480","tags":["x_refsource_MISC"],"url":"https://github.com/nodeca/js-yaml/commit/6a8e05f9a485188ed730ac81e81ae221352ef480"},{"name":"https://github.com/nodeca/js-yaml/commit/d90b6612a5a84385bdcb556c44578eac76dc0f6b","tags":["x_refsource_MISC"],"url":"https://github.com/nodeca/js-yaml/commit/d90b6612a5a84385bdcb556c44578eac76dc0f6b"},{"name":"https://github.com/nodeca/js-yaml/releases/tag/3.15.2","tags":["x_refsource_MISC"],"url":"https://github.com/nodeca/js-yaml/releases/tag/3.15.2"},{"name":"https://github.com/nodeca/js-yaml/releases/tag/4.3.2","tags":["x_refsource_MISC"],"url":"https://github.com/nodeca/js-yaml/releases/tag/4.3.2"},{"name":"https://github.com/nodeca/js-yaml/releases/tag/5.4.1","tags":["x_refsource_MISC"],"url":"https://github.com/nodeca/js-yaml/releases/tag/5.4.1"}],"affected":[{"vendor":"nodeca","product":"js-yaml","versions":[{"version":">= 3.0.0, < 3.15.2","status":"affected"},{"version":">= 4.0.0, < 4.3.2","status":"affected"},{"version":">= 5.0.0, < 5.4.1","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-09-28T21:32:39.387Z"},"descriptions":[{"lang":"en","value":"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."}],"source":{"advisory":"GHSA-2883-xcg3-v3hh","discovery":"UNKNOWN"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-02T13:43:50.850378Z","id":"CVE-2026-84375","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-09-02T16:02:06.745Z"}}]}}