{"action":"Upgrade immutable to 3.8.4 or later.","affected":[{"fixed":"4.3.9","introduced":"4.0.0-rc.1"},{"fixed":"5.1.8","introduced":"5.0.0-beta.1"},{"fixed":"3.8.4","introduced":"0"}],"component":"immutable","cve_ids":["CVE-2026-59879"],"ecosystem":"npm","epss":0.00575,"exploited":false,"fixed_versions":["4.3.9","5.1.8","3.8.4"],"ghsa_id":"GHSA-v56q-mh7h-f735","id":"tcs_01M5KGASDQMX0QPFJVV179YEBS","modified_at":"2026-09-16T19:00:05.205190333Z","published_at":"2026-07-21T18:36:27Z","references":["https://osv.dev/vulnerability/GHSA-v56q-mh7h-f735","https://github.com/immutable-js/immutable-js/security/advisories/GHSA-v56q-mh7h-f735","https://nvd.nist.gov/vuln/detail/CVE-2026-59879","https://github.com/immutable-js/immutable-js/commit/a1a1ee412dcaa380ab325196283d06594ffe4b84","https://github.com/immutable-js/immutable-js/commit/f0bc997d8eb9886aff2236635aa210a95a04304a","https://github.com/immutable-js/immutable-js","https://github.com/immutable-js/immutable-js/releases/tag/v3.8.4","https://github.com/immutable-js/immutable-js/releases/tag/v4.3.9","https://github.com/immutable-js/immutable-js/releases/tag/v5.1.8"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"GHSA-v56q-mh7h-f735","url":"https://osv.dev/vulnerability/GHSA-v56q-mh7h-f735"}],"summary":"Immutable.js `List` 32-bit trie overflow → unrecoverable DoS"}