CVE-2026-21710 (GCVE-0-2026-21710)
Vulnerability from cvelistv5
Published
2026-03-30 19:07
Modified
2026-07-15 01:19
Severity ?
7.5 (High) - CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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**
References
Impacted products
Vendor Product Version
nodejs node Version: 20.20.1   ≤ 20.20.1
Version: 22.22.1   ≤ 22.22.1
Version: 24.14.0   ≤ 24.14.0
Version: 25.8.1   ≤ 25.8.1
Version: 4.0   ≤
Version: 5.0   ≤
Version: 6.0   ≤
Version: 7.0   ≤
Version: 8.0   ≤
Version: 9.0   ≤
Version: 10.0   ≤
Version: 11.0   ≤
Version: 12.0   ≤
Version: 13.0   ≤
Version: 14.0   ≤
Version: 15.0   ≤
Version: 16.0   ≤
Version: 17.0   ≤
Version: 18.0   ≤
Version: 19.0   ≤
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}


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