{"id":"DEBIAN-CVE-2026-21710","details":"A flaw in Node.js HTTP request handling causes an uncaught `TypeError` when a request is received with a header named `__proto__` and the application accesses `req.headersDistinct`.\r \r When this occurs, `dest[\"__proto__\"]` resolves to `Object.prototype` rather than `undefined`, causing `.push()` to be called on a non-array. This exception is thrown synchronously inside a property getter and cannot be intercepted by `error` event listeners, meaning it cannot be handled without wrapping every `req.headersDistinct` access in a `try/catch`.\r \r * This vulnerability affects all Node.js HTTP servers on **20.x, 22.x, 24.x, and v25.x**","modified":"2026-08-27T23:05:46.622294019Z","published":"2026-03-30T20:16:18.210Z","upstream":["CVE-2026-21710"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-21710"}],"affected":[{"package":{"name":"nodejs","ecosystem":"Debian:12","purl":"pkg:deb/debian/nodejs?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"18.20.4+dfsg-1~deb12u2"}]}],"versions":["18.13.0+dfsg1-1","18.13.0+dfsg1-1.1","18.19.0+dfsg-1","18.19.0+dfsg-2","18.19.0+dfsg-3","18.19.0+dfsg-4","18.19.0+dfsg-5","18.19.0+dfsg-6","18.19.0+dfsg-6~deb12u1","18.19.0+dfsg-6~deb12u2","18.19.1+dfsg-1","18.19.1+dfsg-2","18.19.1+dfsg-3","18.19.1+dfsg-3.1","18.19.1+dfsg-4","18.19.1+dfsg-6","18.20.1+dfsg-1","18.20.1+dfsg-2","18.20.1+dfsg-3","18.20.1+dfsg-4","18.20.4+dfsg-1~deb12u1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-21710.json"}},{"package":{"name":"nodejs","ecosystem":"Debian:13","purl":"pkg:deb/debian/nodejs?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"20.19.2+dfsg-1+deb13u2"}]}],"versions":["20.19.2+dfsg-1","20.19.2+dfsg-1+deb13u1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-21710.json"}},{"package":{"name":"nodejs","ecosystem":"Debian:14","purl":"pkg:deb/debian/nodejs?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"22.22.2+dfsg+~cs22.19.15-1"}]}],"versions":["20.19.2+dfsg-1","20.19.4+dfsg-1","20.19.5+dfsg+~cs20.19.12-1","20.19.5+dfsg+~cs20.19.12-2","20.19.5+dfsg+~cs20.19.12-3","20.19.5+dfsg+~cs20.19.12-4","20.19.5+dfsg+~cs20.19.24-1","22.12.0+dfsg-1","22.12.0+dfsg-2","22.12.0+dfsg-3","22.14.0+dfsg-1","22.18.0+dfsg+~cs22.17.2-1","22.18.0+dfsg+~cs22.17.2-2","22.18.0+dfsg-1","22.19.0+dfsg+~cs22.18.0-1","22.21.1+dfsg+~cs22.19.0-1","22.21.1+dfsg+~cs22.19.0-2","22.21.1+dfsg+~cs22.19.0-3","22.21.1+dfsg+~cs22.19.0-4","22.21.1+dfsg+~cs22.19.0-5","22.21.1+dfsg+~cs22.19.0-6","22.22.0+dfsg+~cs22.19.13-1","22.22.0+dfsg+~cs22.19.13-2","22.22.0+dfsg+~cs22.19.6-1","22.22.1+dfsg+~cs22.19.15-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-21710.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}