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This can let an attacker add or modify existing property that will exist on all object. This can lead to denial of service or remote code execution.","references":[{"reference_url":"https://github.com/jonschlinkert/assign-deep/commit/19953a8c089b0328c470acaaaf6accdfcb34da11","reference_id":"","reference_type":"","scores":[],"url":"https://github.com/jonschlinkert/assign-deep/commit/19953a8c089b0328c470acaaaf6accdfcb34da11"},{"reference_url":"https://hackerone.com/reports/310707","reference_id":"","reference_type":"","scores":[],"url":"https://hackerone.com/reports/310707"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/54016?format=json","purl":"pkg:npm/assign-deep@0.4.7","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-7h55-6x64-2qh3"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:npm/assign-deep@0.4.7"}],"aliases":["GMS-2018-15"],"risk_score":null,"exploitability":"0.5","weighted_severity":"0.0","resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-ekvn-3h9v-4yd4"},{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/12554?format=json","vulnerability_id":"VCID-k7n2-a3fq-d3dh","summary":"assign-deep node module suffers from a Modification of Assumed-Immutable Data (MAID) vulnerability, which allows a malicious user to modify the prototype of `Object` via `__proto__`, causing the addition or modification of an existing property that will exist on all objects.","references":[{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2018-3720","reference_id":"","reference_type":"","scores":[{"value":"0.0043","scoring_system":"epss","scoring_elements":"0.62815","published_at":"2026-05-30T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2018-3720"},{"reference_url":"https://github.com/jonschlinkert/assign-deep/commit/19953a8c089b0328c470acaaaf6accdfcb34da11","reference_id":"","reference_type":"","scores":[{"value":"8.8","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/jonschlinkert/assign-deep/commit/19953a8c089b0328c470acaaaf6accdfcb34da11"},{"reference_url":"https://hackerone.com/reports/310707","reference_id":"","reference_type":"","scores":[{"value":"1.8","scoring_system":"cvssv3","scoring_elements":""},{"value":"8.8","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://hackerone.com/reports/310707"},{"reference_url":"https://www.npmjs.com/advisories/579","reference_id":"","reference_type":"","scores":[{"value":"8.8","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://www.npmjs.com/advisories/579"},{"reference_url":"https://github.com/nodejs/security-wg/blob/main/vuln/npm/370.json","reference_id":"370","reference_type":"","scores":[{"value":"1.8","scoring_system":"cvssv3","scoring_elements":""}],"url":"https://github.com/nodejs/security-wg/blob/main/vuln/npm/370.json"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2018-3720","reference_id":"CVE-2018-3720","reference_type":"","scores":[{"value":"8.8","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2018-3720"},{"reference_url":"https://github.com/advisories/GHSA-xcvv-84j5-jw9h","reference_id":"GHSA-xcvv-84j5-jw9h","reference_type":"","scores":[{"value":"8.8","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},{"value":"HIGH","scoring_system":"cvssv3.1_qr","scoring_elements":""},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/advisories/GHSA-xcvv-84j5-jw9h"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/54016?format=json","purl":"pkg:npm/assign-deep@0.4.7","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-7h55-6x64-2qh3"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:npm/assign-deep@0.4.7"}],"aliases":["CVE-2018-3720","GHSA-xcvv-84j5-jw9h"],"risk_score":4.0,"exploitability":"0.5","weighted_severity":"8.0","resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-k7n2-a3fq-d3dh"}],"fixing_vulnerabilities":[],"risk_score":"4.0","resource_url":"http://public2.vulnerablecode.io/packages/pkg:npm/assign-deep@0.4.4"}