High
Security advisory
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 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`. * This vulnerability affects all Node.js HTTP servers on **20.x, 22.x, 24.x, and v25.x**
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-21710
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 2 Nov 2026, 20:12 UTC · Revision 1
Source evidence
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 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`. * This vulnerability affects all Node.js HTTP servers on **20.x, 22.x, 24.x, and v25.x**
osv:CVE-2026-21710
Complete source record
{
"id": "b6bc5d0563c0433a7b62c2257a82badd370684b6f3bad2b2b804d4b2319b2108",
"url": "https://osv.dev/vulnerability/CVE-2026-21710",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2026-21710",
"summary": "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 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`. * This vulnerability affects all Node.js HTTP servers on **20.x, 22.x, 24.x, and v25.x**",
"evidence": "osv:CVE-2026-21710",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-21710",
"aliases": [
"BIT-node-2026-21710",
"BIT-node-min-2026-21710",
"CVE-2026-21710"
],
"metrics": [
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"type": "CVSS_V3",
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"modified": "2026-10-28T02:30:23.091693497Z",
"provider": "osv",
"references": [
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"https://access.redhat.com/errata/RHSA-2026:7080",
"https://access.redhat.com/errata/RHSA-2026:7123",
"https://access.redhat.com/errata/RHSA-2026:7302",
"https://access.redhat.com/errata/RHSA-2026:7310",
"https://access.redhat.com/errata/RHSA-2026:7350",
"https://access.redhat.com/errata/RHSA-2026:7670",
"https://access.redhat.com/errata/RHSA-2026:7675",
"https://access.redhat.com/errata/RHSA-2026:7896",
"https://access.redhat.com/errata/RHSA-2026:7983",
"https://access.redhat.com/errata/RHSA-2026:8339",
"https://access.redhat.com/errata/RHSA-2026:9711",
"https://access.redhat.com/errata/RHSA-2026:9874",
"https://access.redhat.com/security/cve/CVE-2026-21710",
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"https://nvd.nist.gov/vuln/detail/CVE-2026-21710",
"https://bugzilla.redhat.com/show_bug.cgi?id=2453151",
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},
"related_cves": [
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"value": "CVE-2026-21710",
"evidence": "/id"
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"source_id": "core-osv",
"document_id": 489696,
"published_at": "2026-03-30T19:07:28.558+00:00"
}