{"action":"Upgrade immutable to 3.8.4 or later.","affected":[{"fixed":"4.3.9","introduced":"4.0.0-beta.1"},{"fixed":"5.1.8","introduced":"5.0.0-beta.1"},{"fixed":"3.8.4","introduced":"0"}],"component":"immutable","cve_ids":["CVE-2026-59880"],"ecosystem":"npm","epss":0.00665,"exploited":false,"fixed_versions":["4.3.9","5.1.8","3.8.4"],"ghsa_id":"GHSA-xvcm-6775-5m9r","id":"tcs_01M5KGJXMCK3AG7W4G4AAN54R0","modified_at":"2026-09-10T03:51:12.758661308Z","published_at":"2026-07-21T19:02:33Z","references":["https://osv.dev/vulnerability/GHSA-xvcm-6775-5m9r","https://github.com/immutable-js/immutable-js/security/advisories/GHSA-xvcm-6775-5m9r","https://nvd.nist.gov/vuln/detail/CVE-2026-59880","https://github.com/immutable-js/immutable-js/commit/3dd7e5655012597a41873e328bf9142a8901527b","https://github.com/immutable-js/immutable-js/commit/e51d49fc612ded5ec4dfb94ff294d22074269b0f","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-xvcm-6775-5m9r","url":"https://osv.dev/vulnerability/GHSA-xvcm-6775-5m9r"},{"source":"nvd","source_id":"CVE-2026-59880","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-59880"}],"summary":"Immutable: Hash-collision algorithmic complexity denial of service in Immutable.Map/Set"}