THREAT OPS › Threat News › [NVD] CVE-2026-21710 (HIGH 7.5) — 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`.
When this occurs, `dest["__proto__"]` resolves to `Object.prototype` rather than `undefined`, c
[NVD] CVE-2026-21710 (HIGH 7.5) — 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`. When this occurs, `dest["__proto__"]` resolves to `Object.prototype` rather than `undefined`, c
CVE-2026-21710 CVSS: 7.5 HIGH Published: 2026-03-30T20:16:18.210
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`.
When this occurs, `dest["__proto__"]` resolves to `Object.prototype` rather than `undefined`, causing `.push()` to be called on a non-array. This exc
Indicators of compromise
- CVE-2026-21710cve
Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-21710