{"id":"BIT-node-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\n\r\nWhen 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\n\r\n* This vulnerability affects all Node.js HTTP servers on **20.x, 22.x, 24.x, and v25.x**","aliases":["BIT-node-min-2026-21710","CVE-2026-21710"],"modified":"2026-04-13T08:15:54.030560Z","published":"2026-04-06T07:58:28.068Z","database_specific":{"severity":"High","cpes":["cpe:2.3:a:nodejs:node.js:*:*:*:*:*:*:*:*"]},"references":[{"type":"WEB","url":"https://nodejs.org/en/blog/vulnerability/march-2026-security-releases"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-21710"}],"affected":[{"package":{"name":"node","ecosystem":"Bitnami","purl":"pkg:bitnami/node"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"20.20.2"},{"introduced":"21.0.0"},{"fixed":"22.22.2"},{"introduced":"23.0.0"},{"fixed":"24.14.1"},{"introduced":"25.0.0"},{"fixed":"25.8.2"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/node/BIT-node-2026-21710.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}],"schema_version":"1.7.5"}