DEBIAN-CVE-2026-21637

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Source
https://security-tracker.debian.org/tracker/CVE-2026-21637
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-21637.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-21637
Upstream
Downstream
Published
2026-01-20T21:16:05Z
Modified
2026-09-14T17:02:39Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

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.

References

Affected packages

Debian:12 / nodejs

Package

Name
nodejs
Purl
pkg:deb/debian/nodejs?arch=source&distro=bookworm

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
18.20.4+dfsg-1~deb12u2

Affected versions

18.*
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~deb12u1
18.19.0+dfsg-6~deb12u2
18.19.0+dfsg-6
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

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-21637.json"

Debian:13 / nodejs

Package

Name
nodejs
Purl
pkg:deb/debian/nodejs?arch=source&distro=trixie

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
20.19.2+dfsg-1+deb13u2

Affected versions

20.*
20.19.2+dfsg-1
20.19.2+dfsg-1+deb13u1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-21637.json"

Debian:14 / nodejs

Package

Name
nodejs
Purl
pkg:deb/debian/nodejs?arch=source&distro=forky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
22.22.2+dfsg+~cs22.19.15-1

Affected versions

20.*
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.*
22.12.0+dfsg-1
22.12.0+dfsg-2
22.12.0+dfsg-3
22.14.0+dfsg-1
22.18.0+dfsg-1
22.18.0+dfsg+~cs22.17.2-1
22.18.0+dfsg+~cs22.17.2-2
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+~cs22.19.6-1
22.22.0+dfsg+~cs22.19.13-1
22.22.0+dfsg+~cs22.19.13-2
22.22.1+dfsg+~cs22.19.15-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-21637.json"