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CVE search · CVE-2026-21710

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`, 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**

Open in the NVD CVE.org JSON

Details

Status
Analyzed
Published
Last changed
Source
support@hackerone.com
Weakness
CWE-770, CWE-843

Severity

VersionScoreVectorSource
CVSS 3.1 high 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H 0b0ca135-0b70-47e7-9f44-1890c2a1c46cSecondary
CVSS 3.0 high 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H support@hackerone.comSecondary

Affected products

Vendor and product from the NVD’s CPE applicability statements. Versions and conditions are on the NVD’s page.

References