UBUNTU-CVE-2026-84375

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Source
https://ubuntu.com/security/CVE-2026-84375
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-84375.json
JSON Data
https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2026-84375
Upstream
Published
2026-09-01T22:17:00Z
Modified
2026-10-01T00:28:48Z
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
  • Ubuntu - medium
Summary
[none]
Details

js-yaml is a JavaScript YAML parser and dumper. From 3.0.0 until 3.15.2, 4.3.2, and 5.4.1, maxTotalMergeKeys in lib/js-yaml/loader.js and lib/loader.js does not count empty mapping sources while processing the merge key <<. An attacker can alias a large sequence of empty mappings into many merge targets, causing O(N * K) processing while totalMergeKeys remains unchanged and the configured resource limit is never reached. A relatively small YAML document can therefore cause prolonged CPU consumption in applications that parse untrusted YAML, and merge processing is enabled by default on these release lines. In v3 & v4, merge is enabled by default so the severity score is higher. This issue is fixed in versions 3.15.2, 4.3.2, and 5.4.1.

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
0 Unknown 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-2026-84375.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
0 Unknown 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-2026-84375.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
0 Unknown 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-2026-84375.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
0 Unknown 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-2026-84375.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
0 Unknown 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-2026-84375.json"