DEBIAN-CVE-2026-21710
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**
DEBIAN-CVE-2026-21710
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:DEBIAN-CVE-2026-21710
nodejs
Source reference: /affected/0/package/name
- Affected versions
- 18.13.0+dfsg1-1
Source reference:
/affected/0/versions18.13.0+dfsg1-1.1Source reference:
/affected/0/versions18.19.0+dfsg-1Source reference:
/affected/0/versions18.19.0+dfsg-2Source reference:
/affected/0/versions18.19.0+dfsg-3Source reference:
/affected/0/versions18.19.0+dfsg-4Source reference:
/affected/0/versions18.19.0+dfsg-5Source reference:
/affected/0/versions18.19.0+dfsg-6Source reference:
/affected/0/versions18.19.0+dfsg-6~deb12u1Source reference:
/affected/0/versions18.19.0+dfsg-6~deb12u2Source reference:
/affected/0/versions18.19.1+dfsg-1Source reference:
/affected/0/versions18.19.1+dfsg-2Source reference:
/affected/0/versions18.19.1+dfsg-3Source reference:
/affected/0/versions18.19.1+dfsg-3.1Source reference:
/affected/0/versions18.19.1+dfsg-4Source reference:
/affected/0/versions18.19.1+dfsg-6Source reference:
/affected/0/versions18.20.1+dfsg-1Source reference:
/affected/0/versions18.20.1+dfsg-2Source reference:
/affected/0/versions18.20.1+dfsg-3Source reference:
/affected/0/versions18.20.1+dfsg-4Source reference:
/affected/0/versions18.20.4+dfsg-1~deb12u1Source reference:
/affected/0/versions - Fixed versions
- 18.20.4+dfsg-1~deb12u2
Source reference:
/affected/0/ranges - Prerequisites
- Not stated in this record
nodejs
Source reference: /affected/1/package/name
- Affected versions
- 20.19.2+dfsg-1
Source reference:
/affected/1/versions20.19.2+dfsg-1+deb13u1Source reference:
/affected/1/versions - Fixed versions
- 20.19.2+dfsg-1+deb13u2
Source reference:
/affected/1/ranges - Prerequisites
- Not stated in this record
nodejs
Source reference: /affected/2/package/name
- Affected versions
- 20.19.2+dfsg-1
Source reference:
/affected/2/versions20.19.4+dfsg-1Source reference:
/affected/2/versions20.19.5+dfsg+~cs20.19.12-1Source reference:
/affected/2/versions20.19.5+dfsg+~cs20.19.12-2Source reference:
/affected/2/versions20.19.5+dfsg+~cs20.19.12-3Source reference:
/affected/2/versions20.19.5+dfsg+~cs20.19.12-4Source reference:
/affected/2/versions20.19.5+dfsg+~cs20.19.24-1Source reference:
/affected/2/versions22.12.0+dfsg-1Source reference:
/affected/2/versions22.12.0+dfsg-2Source reference:
/affected/2/versions22.12.0+dfsg-3Source reference:
/affected/2/versions22.14.0+dfsg-1Source reference:
/affected/2/versions22.18.0+dfsg+~cs22.17.2-1Source reference:
/affected/2/versions22.18.0+dfsg+~cs22.17.2-2Source reference:
/affected/2/versions22.18.0+dfsg-1Source reference:
/affected/2/versions22.19.0+dfsg+~cs22.18.0-1Source reference:
/affected/2/versions22.21.1+dfsg+~cs22.19.0-1Source reference:
/affected/2/versions22.21.1+dfsg+~cs22.19.0-2Source reference:
/affected/2/versions22.21.1+dfsg+~cs22.19.0-3Source reference:
/affected/2/versions22.21.1+dfsg+~cs22.19.0-4Source reference:
/affected/2/versions22.21.1+dfsg+~cs22.19.0-5Source reference:
/affected/2/versions22.21.1+dfsg+~cs22.19.0-6Source reference:
/affected/2/versions22.22.0+dfsg+~cs22.19.13-1Source reference:
/affected/2/versions22.22.0+dfsg+~cs22.19.13-2Source reference:
/affected/2/versions22.22.0+dfsg+~cs22.19.6-1Source reference:
/affected/2/versions22.22.1+dfsg+~cs22.19.15-1Source reference:
/affected/2/versions - Fixed versions
- 22.22.2+dfsg+~cs22.19.15-1
Source reference:
/affected/2/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "18.20.4+dfsg-1~deb12u2"
}
]
}
],
"package": {
"name": "nodejs",
"purl": "pkg:deb/debian/nodejs?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"18.13.0+dfsg1-1",
"18.13.0+dfsg1-1.1",
"18.19.0+dfsg-1",
"18.19.0+dfsg-2",
"18.19.0+dfsg-3",
"18.19.0+dfsg-4",
"18.19.0+dfsg-5",
"18.19.0+dfsg-6",
"18.19.0+dfsg-6~deb12u1",
"18.19.0+dfsg-6~deb12u2",
"18.19.1+dfsg-1",
"18.19.1+dfsg-2",
"18.19.1+dfsg-3",
"18.19.1+dfsg-3.1",
"18.19.1+dfsg-4",
"18.19.1+dfsg-6",
"18.20.1+dfsg-1",
"18.20.1+dfsg-2",
"18.20.1+dfsg-3",
"18.20.1+dfsg-4",
"18.20.4+dfsg-1~deb12u1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-21710.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "20.19.2+dfsg-1+deb13u2"
}
]
}
],
"package": {
"name": "nodejs",
"purl": "pkg:deb/debian/nodejs?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"20.19.2+dfsg-1",
"20.19.2+dfsg-1+deb13u1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-21710.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "22.22.2+dfsg+~cs22.19.15-1"
}
]
}
],
"package": {
"name": "nodejs",
"purl": "pkg:deb/debian/nodejs?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"20.19.2+dfsg-1",
"20.19.4+dfsg-1",
"20.19.5+dfsg+~cs20.19.12-1",
"20.19.5+dfsg+~cs20.19.12-2",
"20.19.5+dfsg+~cs20.19.12-3",
"20.19.5+dfsg+~cs20.19.12-4",
"20.19.5+dfsg+~cs20.19.24-1",
"22.12.0+dfsg-1",
"22.12.0+dfsg-2",
"22.12.0+dfsg-3",
"22.14.0+dfsg-1",
"22.18.0+dfsg+~cs22.17.2-1",
"22.18.0+dfsg+~cs22.17.2-2",
"22.18.0+dfsg-1",
"22.19.0+dfsg+~cs22.18.0-1",
"22.21.1+dfsg+~cs22.19.0-1",
"22.21.1+dfsg+~cs22.19.0-2",
"22.21.1+dfsg+~cs22.19.0-3",
"22.21.1+dfsg+~cs22.19.0-4",
"22.21.1+dfsg+~cs22.19.0-5",
"22.21.1+dfsg+~cs22.19.0-6",
"22.22.0+dfsg+~cs22.19.13-1",
"22.22.0+dfsg+~cs22.19.13-2",
"22.22.0+dfsg+~cs22.19.6-1",
"22.22.1+dfsg+~cs22.19.15-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-21710.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #56615 · Revision 1
- Added to Heist Feed
- Publisher date