{"id":"EUVD-2026-83258","revision":"6eb6a618981641df81d6e9da9e8bf500","records":[{"revision":"6eb6a618981641df81d6e9da9e8bf500","observedAt":"2026-10-28T10:37:23.74+00:00","statement":{"source":"euvd","id":"EUVD-2026-83258","aliases":["CVE-2026-93753","GHSA-gcqx-w48m-w2h4"],"title":"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 in…","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":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD 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":null}],"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://euvd.enisa.europa.eu/vulnerability/EUVD-2026-83258","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Sep 18, 2026, 5:51:37 PM","dateUpdated":"Sep 24, 2026, 2:23:12 PM"},"relatedAdvisories":[],"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-2026-83258","identifiers":["EUVD-2026-83258","CVE-2026-93753","GHSA-gcqx-w48m-w2h4"]},"retained":false,"historicalAffected":[]}],"coverage":[]}