{"id":"UBUNTU-CVE-2026-8161","details":"multiparty@4.2.3 and lower versions are vulnerable to denial of service via uncaught exception. By sending a multipart/form-data request with a field name that collides with an inherited Object.prototype property such as __proto__, constructor, or toString, the parser invokes .push() on the inherited prototype value rather than an array, throwing a TypeError that propagates as an uncaught exception and crashes the process. Impact: any service accepting multipart uploads via multiparty is affected. Workarounds: none. Upgrade to multiparty@4.3.0 or higher.","modified":"2026-06-24T11:00:25.241818220Z","published":"2026-05-12T10:16:00Z","upstream":["CVE-2026-8161"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-8161"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-8161"},{"type":"REPORT","url":"https://github.com/pillarjs/multiparty/security/advisories/GHSA-qxch-whhj-8956"}],"affected":[{"package":{"name":"node-multiparty","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/node-multiparty?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.0.0-1"],"ecosystem_specific":{"binaries":[{"binary_name":"node-multiparty","binary_version":"4.0.0-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8161.json"}},{"package":{"name":"node-multiparty","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/node-multiparty?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.0.0-1","4.0.0-1ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_version":"4.0.0-1ubuntu1","binary_name":"node-multiparty"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8161.json"}},{"package":{"name":"node-multiparty","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/node-multiparty?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.2.1-1","4.2.1-2"],"ecosystem_specific":{"binaries":[{"binary_name":"node-multiparty","binary_version":"4.2.1-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8161.json"}},{"package":{"name":"node-multiparty","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/node-multiparty?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.2.2-2","4.2.2-3"],"ecosystem_specific":{"binaries":[{"binary_name":"node-multiparty","binary_version":"4.2.2-3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8161.json"}},{"package":{"name":"node-multiparty","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/node-multiparty?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.2.3-2"],"ecosystem_specific":{"binaries":[{"binary_name":"node-multiparty","binary_version":"4.2.3-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8161.json"}},{"package":{"name":"node-multiparty","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/node-multiparty?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.2.3-2","4.2.3-3"],"ecosystem_specific":{"binaries":[{"binary_name":"node-multiparty","binary_version":"4.2.3-3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8161.json"}},{"package":{"name":"node-multiparty","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/node-multiparty?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.2.3-3","4.2.3-4build1","4.2.3-5"],"ecosystem_specific":{"binaries":[{"binary_name":"node-multiparty","binary_version":"4.2.3-5"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8161.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}