{"id":"AZL-81257","summary":"CVE-2026-21710 affecting package nodejs24 for versions less than 24.14.1-1","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**","modified":"2026-08-28T17:47:33.948516876Z","published":"2026-03-30T20:16:18Z","upstream":["CVE-2026-21710"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-21710"}],"affected":[{"package":{"name":"nodejs24","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/nodejs24"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"24.14.1-1"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-81257.json"}}],"schema_version":"1.9.0"}