UBUNTU-CVE-2026-53550

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Source
https://ubuntu.com/security/CVE-2026-53550
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-53550.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-53550
Upstream
Published
2026-06-22T16:16:00Z
Modified
2026-07-01T23:43:24.817277811Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

js-yaml is a JavaScript YAML parser and dumper. Prior to 4.2.0 and 3.15.0, a crafted YAML document can trigger algorithmic CPU exhaustion in js-yaml merge-key processing (<<) by repeating the same alias many times in a merge sequence. This causes quadratic parse-time behavior relative to input size and can block a Node.js worker/event loop for seconds with a relatively small payload (tens of KB), resulting in denial of service. The issue is in merge handling inside lib/loader.js. This vulnerability is fixed in 4.2.0 and 3.15.0.

References

Affected packages

Ubuntu:18.04:LTS
node-js-yaml

Package

Name
node-js-yaml
Purl
pkg:deb/ubuntu/node-js-yaml?arch=source&distro=bionic

Affected ranges

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

Affected versions

3.*
3.9.1+dfsg-1
3.10.0+dfsg-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "node-js-yaml",
            "binary_version": "3.10.0+dfsg-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-53550.json"
Ubuntu:20.04:LTS
node-js-yaml

Package

Name
node-js-yaml
Purl
pkg:deb/ubuntu/node-js-yaml?arch=source&distro=focal

Affected ranges

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

Affected versions

3.*
3.13.1+dfsg-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "node-js-yaml",
            "binary_version": "3.13.1+dfsg-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-53550.json"
Ubuntu:22.04:LTS
node-js-yaml

Package

Name
node-js-yaml
Purl
pkg:deb/ubuntu/node-js-yaml?arch=source&distro=jammy

Affected ranges

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

Affected versions

3.*
3.14.1+dfsg+~3.12.6-2
4.*
4.1.0+dfsg+~4.0.5-4ubuntu1
4.1.0+dfsg+~4.0.5-5
4.1.0+dfsg+~4.0.5-6

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "node-js-yaml",
            "binary_version": "4.1.0+dfsg+~4.0.5-6"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-53550.json"
Ubuntu:24.04:LTS
node-js-yaml

Package

Name
node-js-yaml
Purl
pkg:deb/ubuntu/node-js-yaml?arch=source&distro=noble

Affected ranges

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

Affected versions

4.*
4.1.0+dfsg+~4.0.5-7

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "node-js-yaml",
            "binary_version": "4.1.0+dfsg+~4.0.5-7"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-53550.json"
Ubuntu:25.10
node-js-yaml

Package

Name
node-js-yaml
Purl
pkg:deb/ubuntu/node-js-yaml?arch=source&distro=questing

Affected ranges

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

Affected versions

4.*
4.1.0+dfsg+~4.0.5-7

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "node-js-yaml",
            "binary_version": "4.1.0+dfsg+~4.0.5-7"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-53550.json"
Ubuntu:26.04:LTS
node-js-yaml

Package

Name
node-js-yaml
Purl
pkg:deb/ubuntu/node-js-yaml?arch=source&distro=resolute

Affected ranges

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

Affected versions

4.*
4.1.0+dfsg+~4.0.5-7
4.1.1+dfsg+~4.0.9-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "node-js-yaml",
            "binary_version": "4.1.1+dfsg+~4.0.9-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-53550.json"