{"id":"CVE-2026-93753","aliases":["DEBIAN-CVE-2026-93753","EUVD-2026-83258","GHSA-gcqx-w48m-w2h4","UBUNTU-CVE-2026-93753","openSUSE-SU-2026:12285-1"],"status":"rejected","title":"deepmerge mergeObject() allows prototype poisoning of returned objects","description":"This CVE ID has been rejected because it does not describe a security vulnerability.","severity":{"version":"4.0","score":2.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U","level":"low","from":"ghsa"},"epss":{"day":"2026-11-02","score":0.00514,"percentile":0.43807,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-1321"],"published":"2026-09-18T17:51:37Z","modified":"2026-11-05T11:47:36Z","fixes":[{"ecosystem":"openSUSE:Tumbleweed","package":"golang-github-prometheus-prometheus","fixed_in":["3.15.0-2.1"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"deepmerge","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.2.0"},{"last_affected":"4.3.1"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"node-deepmerge","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.2.2+~1.1.1-3","4.3.1+~1.1.1-1"]},{"source":"osv","ecosystem":"Debian:13","package":"node-deepmerge","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.3.1+~1.1.1-1"]},{"source":"osv","ecosystem":"Debian:14","package":"node-deepmerge","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.3.1+~1.1.1-1"]},{"source":"osv","ecosystem":"npm","package":"deepmerge","ranges":[{"type":"SEMVER","events":[{"introduced":"4.2.0"},{"last_affected":"4.3.1"}]}]},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"golang-github-prometheus-prometheus","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.15.0-2.1"}]}]}],"references":[{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93753","tags":["advisory"]},{"url":"https://github.com/TehShrike/deepmerge/issues/273","tags":["report","web"]},{"url":"https://github.com/TehShrike/deepmerge/blob/5b87756a5671635679001cbac72aa42f23472c81/index.js#L39-L60","tags":["article","web","report"]},{"url":"https://www.vulncheck.com/advisories/deepmerge-through-4.3.1-prototype-poisoning-via-mergeobject","tags":["advisory","web","report"]},{"url":"https://github.com/advisories/GHSA-gcqx-w48m-w2h4"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93753.json","tags":["advisory"]},{"url":"https://github.com/TehShrike/deepmerge","tags":["package","report"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-93753","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-93753","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-93753","tags":["report"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2026-93753","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2026-93753","description":"This CVE ID has been rejected because it does not describe a security vulnerability.","status":"rejected","published":"2026-09-18T17:51:37.794Z","modified":"2026-11-02T16:33:19.357Z","updated_at":"2026-11-02T18:00:08.034842Z"}],"euvd":[{"id":"EUVD-2026-83258","description":"This CVE ID has been rejected because it does not describe a security vulnerability.","status":"published","published":"2026-09-18T17:51:37Z","modified":"2026-11-02T16:33:19Z","cvss":[{"version":"4.0","score":8.7,"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","level":"high"}],"updated_at":"2026-11-03T05:08:40.251173Z"}],"ghsa":[{"id":"GHSA-gcqx-w48m-w2h4","title":"deepmerge mergeObject() allows prototype poisoning of returned objects","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.","status":"published","published":"2026-09-18T18:31:44Z","modified":"2026-10-27T21:34:58Z","cvss":[{"version":"4.0","score":2.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U","level":"low"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium"}],"cwes":["CWE-1321"],"updated_at":"2026-11-02T14:41:38.969831Z"}],"nvd":[{"id":"CVE-2026-93753","description":"Rejected reason: This CVE ID has been rejected because it does not describe a security vulnerability.","status":"rejected","published":"2026-09-18T18:18:34.487Z","modified":"2026-11-02T17:17:46.087Z","updated_at":"2026-11-02T20:51:40.94892Z"}],"osv":[{"id":"CVE-2026-93753","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.","status":"published","published":"2026-09-18T17:51:37.794Z","modified":"2026-10-28T17:27:15.880609958Z","cvss":[{"version":"4.0","score":8.7,"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","level":"high"}],"cwes":["CWE-1321"],"updated_at":"2026-11-02T15:45:20.931171Z"},{"id":"DEBIAN-CVE-2026-93753","status":"published","published":"2026-09-18T18:18:34.487Z","modified":"2026-11-03T05:00:08.004727995Z","cvss":[{"version":"4.0","score":8.7,"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"}],"updated_at":"2026-11-03T05:21:42.987954Z"},{"id":"GHSA-gcqx-w48m-w2h4","title":"deepmerge mergeObject() allows prototype poisoning of returned objects","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.","status":"published","published":"2026-09-18T18:31:44Z","modified":"2026-10-27T21:45:04.256048049Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium"},{"version":"4.0","score":2.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U","level":"low"}],"cwes":["CWE-1321"],"updated_at":"2026-11-02T15:46:47.822182Z"},{"id":"UBUNTU-CVE-2026-93753","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.","status":"withdrawn","published":"2026-09-18T18:18:00Z","modified":"2026-11-05T11:47:36.054017866Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"},{"version":"4.0","score":8.7,"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","level":"high"}],"updated_at":"2026-11-05T13:30:00.949926Z"},{"id":"openSUSE-SU-2026:12285-1","title":"golang-github-prometheus-prometheus-3.15.0-2.1 on GA media","description":"These are all security issues fixed in the golang-github-prometheus-prometheus-3.15.0-2.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-10-27T00:00:00Z","modified":"2026-10-28T17:23:13.300685418Z","updated_at":"2026-11-02T16:58:40.245664Z"}]}}