{"id":"CVE-2026-29063","summary":"Immutable.js: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in immutable","details":"Immutable.js provides many Persistent Immutable data structures. Prior to versions 3.8.3, 4.3.7, and 5.1.5, Prototype Pollution is possible in immutable via the mergeDeep(), mergeDeepWith(), merge(), Map.toJS(), and Map.toObject() APIs. This issue has been patched in versions 3.8.3, 4.3.7, and 5.1.5.","aliases":["GHSA-wf6x-7x77-mvgw"],"modified":"2026-04-09T11:20:41.130752Z","published":"2026-03-06T18:25:22.438Z","related":["CGA-8cfg-6hvq-2rc7"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/29xxx/CVE-2026-29063.json","cwe_ids":["CWE-1321"],"cna_assigner":"GitHub_M"},"references":[{"type":"WEB","url":"https://github.com/immutable-js/immutable-js/releases/tag/v3.8.3"},{"type":"WEB","url":"https://github.com/immutable-js/immutable-js/releases/tag/v4.3.8"},{"type":"WEB","url":"https://github.com/immutable-js/immutable-js/releases/tag/v5.1.5"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/29xxx/CVE-2026-29063.json"},{"type":"ADVISORY","url":"https://github.com/immutable-js/immutable-js/security/advisories/GHSA-wf6x-7x77-mvgw"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-29063"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/immutable-js/immutable-js","events":[{"introduced":"0"},{"fixed":"c4074256bf48ab372fdad2b3d47db89306a5211e"}]},{"type":"GIT","repo":"https://github.com/immutable-js/immutable-js","events":[{"introduced":"0"},{"fixed":"485cbe0edf3ca7bb4b9c4a80ac55ba937a291da0"}]},{"type":"GIT","repo":"https://github.com/immutable-js/immutable-js","events":[{"introduced":"0"},{"fixed":"b37b85568632227751ddc8a16034cacc0f42b652"}]}],"versions":["2.0.10","2.0.11","2.0.12","2.0.13","2.0.14","2.0.15","2.0.16","2.0.17","2.0.4","2.0.5","2.0.6","2.0.7","2.0.8","2.0.9","2.1.0","2.2.0","2.2.1","2.2.2","2.3.0","2.3.1","2.3.2","2.5.0","2.5.1","2.6.0","2.6.1","2.6.2","3.0.0","3.0.1","3.0.2","3.0.3","3.1.0","3.2.0","3.2.1","3.3.0","3.4.0","3.4.1","3.5.0","3.6.0","3.6.1","3.6.2","3.6.3","3.6.4","3.7.0","3.7.1","3.7.2","3.7.3","3.7.4","3.7.5","3.7.6","v3.8.0","v3.8.1","v3.8.2","v4.0.0","v4.0.0-rc.1","v4.0.0-rc.10","v4.0.0-rc.11","v4.0.0-rc.12","v4.0.0-rc.13","v4.0.0-rc.14","v4.0.0-rc.15","v4.0.0-rc.2","v4.0.0-rc.3","v4.0.0-rc.4","v4.0.0-rc.6","v4.0.0-rc.7","v4.0.0-rc.8","v4.0.0-rc.9","v4.2.0","v4.2.1","v4.2.2","v4.3.0","v4.3.1","v4.3.3","v4.3.4","v4.3.5","v4.3.6","v4.3.7","v5.0.1","v5.0.2","v5.1.1","v5.1.2","v5.1.3","v5.1.4"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-29063.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"}]}