{"id":"EUVD-2026-42300","revision":"6cf9f108c8dd4ed18eb613f3a0bb93c8","records":[{"revision":"6cf9f108c8dd4ed18eb613f3a0bb93c8","observedAt":"2026-11-03T12:01:37.371+00:00","statement":{"source":"euvd","id":"EUVD-2026-42300","aliases":["CVE-2026-59870","GHSA-724g-mxrg-4qvm"],"title":"js-yaml is a JavaScript YAML parser and dumper. Prior to 3.15.1, 4.3.1, and 5.2.1, YAML11_SCHEMA support for the !!omap tag in src/tag/sequence/omap.ts uses omapTag.addItem() to perform a linear duplicate-key scan on every insertion, causin…","description":"js-yaml is a JavaScript YAML parser and dumper. Prior to 3.15.1, 4.3.1, and 5.2.1, YAML11_SCHEMA support for the !!omap tag in src/tag/sequence/omap.ts uses omapTag.addItem() to perform a linear duplicate-key scan on every insertion, causing O(n^2) CPU consumption when yaml.load() parses a crafted ordered-map document. In v3 and v4, !!omap is active and exploitable by default. v5 doesn't use !!omap by default, and the chances of activating it are very low.This issue is fixed in 3.15.1, 4.3.1, and 5.2.1.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":null}],"references":["https://github.com/nodeca/js-yaml/security/advisories/GHSA-724g-mxrg-4qvm","https://github.com/nodeca/js-yaml/commit/22a8071ef032117bc6249c330b240ac3aa2d3ded","https://github.com/nodeca/js-yaml/commit/39f3211a2f01b3c6982710cf21434ab7060acefe","https://github.com/nodeca/js-yaml/commit/c3cc4b0bb9ddb9af2dd9b61e0d56f5ce7983cd4a","https://github.com/nodeca/js-yaml/releases/tag/3.15.1","https://github.com/nodeca/js-yaml/releases/tag/4.3.1","https://github.com/nodeca/js-yaml/releases/tag/5.2.1"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-42300","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Jul 8, 2026, 3:13:20 PM","dateUpdated":"Oct 6, 2026, 3:07:05 PM"},"relatedAdvisories":[{"id":"RHSA-2026:9455","title":"Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update","vulnerabilityIds":["CVE-2026-2950","CVE-2026-8723","CVE-2026-45149","CVE-2026-48615","CVE-2026-48618","CVE-2026-48619","CVE-2026-48928","CVE-2026-48930","CVE-2026-48933","CVE-2026-48934","CVE-2026-48935","CVE-2026-48936","CVE-2026-59868","CVE-2026-59870"]},{"id":"RHSA-2026:34975","title":"Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update","vulnerabilityIds":["CVE-2026-8286","CVE-2026-8458","CVE-2026-8924","CVE-2026-8925","CVE-2026-8926","CVE-2026-8927","CVE-2026-8932","CVE-2026-9079","CVE-2026-9080","CVE-2026-9546","CVE-2026-9547","CVE-2026-11352","CVE-2026-11564","CVE-2026-11586","CVE-2026-11856","CVE-2026-12064","CVE-2026-14683","CVE-2026-14684","CVE-2026-14685","CVE-2026-14686","CVE-2026-15187","CVE-2026-38969","CVE-2026-59868","CVE-2026-59870"]},{"id":"RHSA-2026:35272","title":"Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update","vulnerabilityIds":["CVE-2026-13149","CVE-2026-48619","CVE-2026-48928","CVE-2026-48930","CVE-2026-48934","CVE-2026-48935","CVE-2026-48936","CVE-2026-59868","CVE-2026-59870"]},{"id":"RHSA-2026:33866","title":"Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update","vulnerabilityIds":["CVE-2026-13149","CVE-2026-48619","CVE-2026-48928","CVE-2026-48930","CVE-2026-48934","CVE-2026-48935","CVE-2026-48936","CVE-2026-53550","CVE-2026-59868","CVE-2026-59870"]},{"id":"RHSA-2026:7655","title":"Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update","vulnerabilityIds":["CVE-2026-2950","CVE-2026-45149","CVE-2026-45736","CVE-2026-59868","CVE-2026-59870"]},{"id":"RHSA-2026:34478","title":"Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update","vulnerabilityIds":["CVE-2026-13149","CVE-2026-48619","CVE-2026-48928","CVE-2026-48930","CVE-2026-48934","CVE-2026-48935","CVE-2026-48936","CVE-2026-59868","CVE-2026-59870"]},{"id":"RHSA-2026:26994","title":"Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update","vulnerabilityIds":["CVE-2026-45491","CVE-2026-45591","CVE-2026-45736","CVE-2026-59724","CVE-2026-59868","CVE-2026-59870"]},{"id":"RHSA-2026:7378","title":"Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update","vulnerabilityIds":["CVE-2025-55130","CVE-2025-55131","CVE-2025-55132","CVE-2025-59464","CVE-2026-2950","CVE-2026-6734","CVE-2026-9675","CVE-2026-9678","CVE-2026-9697","CVE-2026-45149","CVE-2026-48615","CVE-2026-48618","CVE-2026-48619","CVE-2026-48928","CVE-2026-48930","CVE-2026-48933","CVE-2026-48934","CVE-2026-48935","CVE-2026-48936","CVE-2026-59868","CVE-2026-59870"]}],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-42300","identifiers":["EUVD-2026-42300","CVE-2026-59870","GHSA-724g-mxrg-4qvm"]},"retained":false,"historicalAffected":[]}],"coverage":[]}