CVE-2026-21710A 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`.
Updated under an hour ago ()
Does this affect you?
It affects nodejs node.js and 2 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Free account, 1 product
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**
- CVSS
- 7.5 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-770, CWE-843
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Aug 19, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
nodejs node.js nodejs:node.js | through 20.20.1; from 22.0.0 through 22.22.1; from 24.0.0 through 24.14.0; from 25.0.0 through 25.8.1 | NVD |
redhat enterprise_linux redhat:enterprise_linux | 8.0; 9.0; 10.0 | NVD |
redhat enterprise_linux_eus redhat:enterprise_linux_eus | 9.4; 9.6; 10.0 | NVD |
References
- https://nodejs.org/en/blog/vulnerability/march-2026-security-releasesvendor-advisory
- https://access.redhat.com/errata/RHSA-2026:7080third-party-advisory
- https://access.redhat.com/errata/RHSA-2026:7123third-party-advisory
- https://access.redhat.com/errata/RHSA-2026:7302third-party-advisory
- https://access.redhat.com/errata/RHSA-2026:7310third-party-advisory
- https://access.redhat.com/errata/RHSA-2026:7350third-party-advisory
- https://access.redhat.com/errata/RHSA-2026:7670third-party-advisory
- https://access.redhat.com/errata/RHSA-2026:7675third-party-advisory
- https://access.redhat.com/errata/RHSA-2026:7896third-party-advisory
- https://access.redhat.com/errata/RHSA-2026:7983third-party-advisory
- https://access.redhat.com/errata/RHSA-2026:8339third-party-advisory
- https://access.redhat.com/errata/RHSA-2026:9711third-party-advisory
- https://access.redhat.com/errata/RHSA-2026:9874third-party-advisory
- https://access.redhat.com/security/cve/CVE-2026-21710third-party-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2453151issue-tracking
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-21710.jsonthird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.