DEBIAN-CVE-2026-21637
A flaw in Node.js TLS error handling allows remote attackers to crash or exhaust resources of a TLS server when `pskCallback` or `ALPNCallback` are in use. Synchronous exceptions thrown during these callbacks bypass standard TLS error handling paths (tlsClientError and error), causing either immediate process termination or silent file descriptor leaks that eventually lead to denial of service. Because these callbacks process attacker-controlled input during the TLS handshake, a remote client can repeatedly trigger the issue. This vulnerability affects TLS servers using PSK or ALPN callbacks across Node.js versions where these callbacks throw without being safely wrapped.
DEBIAN-CVE-2026-21637
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-2026-21637
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-2026-21637.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-2026-21637.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-2026-21637.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #56620 · Revision 1
- Added to Heist Feed
- Publisher date