{"id":"CVE-2026-93753","revision":"f173cfe15fe64ce19bd3a52bcbd5a812","records":[{"revision":"f173cfe15fe64ce19bd3a52bcbd5a812","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-93753","aliases":[],"title":"deepmerge through 4.3.1 Prototype Poisoning via mergeObject","description":"deepmerge through 4.3.1 contains a prototype poisoning vulnerability in the mergeObject() function that fails to properly validate keys being written to target objects. Attackers can supply malicious source objects in merge operations to inject attacker-controlled properties into the returned object's prototype, causing applications to inherit unintended values when accessing properties without own-property checks.","state":0,"publishedAt":"2026-09-18T17:51:37.794+00:00","modifiedAt":"2026-09-24T14:23:12.09+00:00","affected":[{"ecosystem":"Vendor product","name":"deepmerge","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"TehShrike\",\n                    \"product\": \"deepmerge\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"packageURL\": \"pkg:npm/deepmerge\",\n                    \"versions\": [\n                        {\n                            \"version\": \"0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\",\n                            \"lessThanOrEqual\": \"4.3.1\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N","score":8.7,"severity":"HIGH"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","score":7.5,"severity":"HIGH"}],"references":["https://github.com/TehShrike/deepmerge/issues/273","https://github.com/TehShrike/deepmerge","https://github.com/TehShrike/deepmerge/blob/5b87756a5671635679001cbac72aa42f23472c81/index.js#L39-L60","https://www.vulncheck.com/advisories/deepmerge-through-4.3.1-prototype-poisoning-via-mergeobject"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-93753","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-93753","identifiers":["CVE-2026-93753"]},"retained":false,"historicalAffected":[]}],"coverage":[]}