UBUNTU-CVE-2026-21637

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Source
https://ubuntu.com/security/CVE-2026-21637
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-21637.json
JSON Data
https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2026-21637
Upstream
Published
2026-01-20T21:16:00Z
Modified
2026-02-03T09:15:32.440907Z
Severity
  • 5.9 (Medium) CVSS_V3 - CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • 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
  • Ubuntu - medium
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

Ubuntu:24.04:LTS
nodejs

Package

Name
nodejs
Purl
pkg:deb/ubuntu/nodejs@18.19.1+dfsg-6ubuntu5?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

18.*
18.13.0+dfsg1-1ubuntu2
18.19.1+dfsg-2ubuntu4
18.19.1+dfsg-6ubuntu1
18.19.1+dfsg-6ubuntu2
18.19.1+dfsg-6ubuntu5

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "18.19.1+dfsg-6ubuntu5",
            "binary_name": "libnode-dev"
        },
        {
            "binary_version": "18.19.1+dfsg-6ubuntu5",
            "binary_name": "libnode109"
        },
        {
            "binary_version": "18.19.1+dfsg-6ubuntu5",
            "binary_name": "nodejs"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-21637.json"
Ubuntu:25.10
nodejs

Package

Name
nodejs
Purl
pkg:deb/ubuntu/nodejs@20.19.4+dfsg-1?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

20.*
20.18.1+dfsg-1ubuntu2
20.19.2+dfsg-1
20.19.4+dfsg-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "20.19.4+dfsg-1",
            "binary_name": "libnode-dev"
        },
        {
            "binary_version": "20.19.4+dfsg-1",
            "binary_name": "libnode115"
        },
        {
            "binary_version": "20.19.4+dfsg-1",
            "binary_name": "nodejs"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-21637.json"
Ubuntu:Pro:14.04:LTS
nodejs

Package

Name
nodejs
Purl
pkg:deb/ubuntu/nodejs@0.10.25~dfsg2-2ubuntu1.2+esm2?arch=source&distro=esm-infra-legacy/trusty

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.10.15~dfsg1-4
0.10.21~dfsg1-1
0.10.22~dfsg1-2
0.10.23~dfsg1-1
0.10.23~dfsg1-2
0.10.23~dfsg1-3
0.10.24~dfsg1-1
0.10.25~dfsg2-2
0.10.25~dfsg2-2ubuntu1
0.10.25~dfsg2-2ubuntu1.2
0.10.25~dfsg2-2ubuntu1.2+esm1
0.10.25~dfsg2-2ubuntu1.2+esm2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "0.10.25~dfsg2-2ubuntu1.2+esm2",
            "binary_name": "nodejs"
        },
        {
            "binary_version": "0.10.25~dfsg2-2ubuntu1.2+esm2",
            "binary_name": "nodejs-dev"
        },
        {
            "binary_version": "0.10.25~dfsg2-2ubuntu1.2+esm2",
            "binary_name": "nodejs-legacy"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-21637.json"
Ubuntu:Pro:16.04:LTS
nodejs

Package

Name
nodejs
Purl
pkg:deb/ubuntu/nodejs@4.2.6~dfsg-1ubuntu4.2+esm3?arch=source&distro=esm-apps/xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.10.25~dfsg2-2ubuntu1
4.*
4.2.2~dfsg-1
4.2.3~dfsg-1
4.2.4~dfsg-1ubuntu1
4.2.4~dfsg-2
4.2.6~dfsg-1ubuntu1
4.2.6~dfsg-1ubuntu4
4.2.6~dfsg-1ubuntu4.1
4.2.6~dfsg-1ubuntu4.2
4.2.6~dfsg-1ubuntu4.2+esm1
4.2.6~dfsg-1ubuntu4.2+esm2
4.2.6~dfsg-1ubuntu4.2+esm3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.2.6~dfsg-1ubuntu4.2+esm3",
            "binary_name": "nodejs"
        },
        {
            "binary_version": "4.2.6~dfsg-1ubuntu4.2+esm3",
            "binary_name": "nodejs-dev"
        },
        {
            "binary_version": "4.2.6~dfsg-1ubuntu4.2+esm3",
            "binary_name": "nodejs-legacy"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-21637.json"
Ubuntu:Pro:18.04:LTS
nodejs

Package

Name
nodejs
Purl
pkg:deb/ubuntu/nodejs@8.10.0~dfsg-2ubuntu0.4+esm6?arch=source&distro=esm-apps/bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

6.*
6.11.4~dfsg-1ubuntu1
6.11.4~dfsg-1ubuntu2
6.12.0~dfsg-1ubuntu1
6.12.0~dfsg-2ubuntu1
6.12.0~dfsg-2ubuntu2
8.*
8.10.0~dfsg-2
8.10.0~dfsg-2ubuntu0.2
8.10.0~dfsg-2ubuntu0.3
8.10.0~dfsg-2ubuntu0.4
8.10.0~dfsg-2ubuntu0.4+esm1
8.10.0~dfsg-2ubuntu0.4+esm2
8.10.0~dfsg-2ubuntu0.4+esm3
8.10.0~dfsg-2ubuntu0.4+esm4
8.10.0~dfsg-2ubuntu0.4+esm5
8.10.0~dfsg-2ubuntu0.4+esm6

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "8.10.0~dfsg-2ubuntu0.4+esm6",
            "binary_name": "nodejs"
        },
        {
            "binary_version": "8.10.0~dfsg-2ubuntu0.4+esm6",
            "binary_name": "nodejs-dev"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-21637.json"
Ubuntu:Pro:20.04:LTS
nodejs

Package

Name
nodejs
Purl
pkg:deb/ubuntu/nodejs@10.19.0~dfsg-3ubuntu1.6+esm2?arch=source&distro=esm-apps/focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

10.*
10.15.2~dfsg-2ubuntu1
10.17.0~dfsg-2ubuntu4
10.17.0~dfsg-2ubuntu6
10.19.0~dfsg-3ubuntu1
10.19.0~dfsg-3ubuntu1.1
10.19.0~dfsg-3ubuntu1.2
10.19.0~dfsg-3ubuntu1.3
10.19.0~dfsg-3ubuntu1.5
10.19.0~dfsg-3ubuntu1.6
10.19.0~dfsg-3ubuntu1.6+esm2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "10.19.0~dfsg-3ubuntu1.6+esm2",
            "binary_name": "libnode-dev"
        },
        {
            "binary_version": "10.19.0~dfsg-3ubuntu1.6+esm2",
            "binary_name": "libnode64"
        },
        {
            "binary_version": "10.19.0~dfsg-3ubuntu1.6+esm2",
            "binary_name": "nodejs"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-21637.json"
Ubuntu:Pro:22.04:LTS
nodejs

Package

Name
nodejs
Purl
pkg:deb/ubuntu/nodejs@12.22.9~dfsg-1ubuntu3.6+esm2?arch=source&distro=esm-apps/jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

12.*
12.22.5~dfsg-5ubuntu1
12.22.7~dfsg-2ubuntu1
12.22.7~dfsg-2ubuntu3
12.22.9~dfsg-1ubuntu2
12.22.9~dfsg-1ubuntu3
12.22.9~dfsg-1ubuntu3.1
12.22.9~dfsg-1ubuntu3.2
12.22.9~dfsg-1ubuntu3.3
12.22.9~dfsg-1ubuntu3.4
12.22.9~dfsg-1ubuntu3.5
12.22.9~dfsg-1ubuntu3.6
12.22.9~dfsg-1ubuntu3.6+esm2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "12.22.9~dfsg-1ubuntu3.6+esm2",
            "binary_name": "libnode-dev"
        },
        {
            "binary_version": "12.22.9~dfsg-1ubuntu3.6+esm2",
            "binary_name": "libnode72"
        },
        {
            "binary_version": "12.22.9~dfsg-1ubuntu3.6+esm2",
            "binary_name": "nodejs"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-21637.json"