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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**
| Reporter | Title | Published | Views | Family All 211 |
|---|---|---|---|---|
 | CVE-2026-21710 | 30 Mar 202619:07 | – | attackerkb |
 | Amazon Linux 2023 : nodejs22, nodejs22-devel, nodejs22-full-i18n (ALAS2023-2026-1576) | 13 Apr 202600:00 | – | nessus |
| Amazon Linux 2023 : nodejs20, nodejs20-devel, nodejs20-full-i18n (ALAS2023-2026-1577) | 13 Apr 202600:00 | – | nessus |
| Amazon Linux 2023 : nodejs24, nodejs24-devel, nodejs24-full-i18n (ALAS2023-2026-1578) | 13 Apr 202600:00 | – | nessus |
| AlmaLinux 10 : nodejs22 (ALSA-2026:7080) | 10 Apr 202600:00 | – | nessus |
| AlmaLinux 8 : nodejs:22 (ALSA-2026:7123) | 16 Apr 202600:00 | – | nessus |
| AlmaLinux 9 : nodejs:24 (ALSA-2026:7350) | 16 Apr 202600:00 | – | nessus |
| AlmaLinux 8 : nodejs:24 (ALSA-2026:7670) | 16 Apr 202600:00 | – | nessus |
| AlmaLinux 10 : nodejs24 (ALSA-2026:7675) | 15 Apr 202600:00 | – | nessus |
| AlmaLinux 9 : nodejs:20 (ALSA-2026:7896) | 16 Apr 202600:00 | – | nessus |
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09 Apr 2026 08:40Current
7.3High risk
Vulners AI Score7.3
CVSS 37.5
CVSS 3.17.5
EPSS0.13066
SSVC