UBUNTU-CVE-2026-63402

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Source

https://ubuntu.com/security/CVE-2026-63402

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-63402.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-63402

Upstream

CVE-2026-63402

Published

2026-11-03T00:00:00Z

Modified

2026-11-04T03:30:36Z

Severity

5.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:H CVSS Calculator
Ubuntu - medium

Summary

[none]

Details

i18next is an internationalization framework for JavaScript. Prior to version 26.3.4, deepExtend in src/utils.js checks property existence with the in operator and recurses into inherited built-ins reached through Object.prototype. An application must explicitly pass attacker-controlled resource data to addResourceBundle(lng, ns, data, deep, overwrite) with both deep: true and overwrite: true. Source keys such as hasOwnProperty, toString and valueOf can then select shared inherited built-in function objects, and a nested value can overwrite a property of those objects process-wide. For example, making Object.prototype.hasOwnProperty.call non-callable causes subsequent uses, including i18next internals, to throw TypeError, resulting in unrecoverable denial of service and limited integrity impact. The __proto__/constructor guard does not prevent this mechanism because the corruption target is an inherited built-in function rather than the prototype object itself. Default calls without deep merging or with overwrite falsy are unaffected, and no standard i18next backend or integration uses the vulnerable configuration. This issue is distinct from the setPath/key-walking prototype-pollution flaws in i18next-fs-backend (CVE-2026-48713) and i18next-http-middleware (CVE-2026-48714). This issue is fixed in version 26.3.4.

References

Affected packages

Ubuntu:20.04:LTS / node-i18next

Package

Name: node-i18next
Purl: pkg:deb/ubuntu/node-i18next?arch=source&distro=focal

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

17.*

17.0.18-1

19.*

19.0.1+dfsg-1

19.0.2+dfsg-1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "libjs-i18next",
            "binary_version": "19.0.2+dfsg-1"
        },
        {
            "binary_name": "node-i18next",
            "binary_version": "19.0.2+dfsg-1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-63402.json"

Ubuntu:22.04:LTS / node-i18next

Package

Name: node-i18next
Purl: pkg:deb/ubuntu/node-i18next?arch=source&distro=jammy

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

19.*

19.8.4+dfsg-1

21.*

21.3.2+dfsg-1

21.6.4+dfsg-1

21.6.10+dfsg-1

21.6.11+dfsg-1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "libjs-i18next",
            "binary_version": "21.6.11+dfsg-1"
        },
        {
            "binary_name": "node-i18next",
            "binary_version": "21.6.11+dfsg-1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-63402.json"

Ubuntu:24.04:LTS / node-i18next

Package

Name: node-i18next
Purl: pkg:deb/ubuntu/node-i18next?arch=source&distro=noble

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

22.*

22.4.8-1

23.*

23.7.6-1

23.7.6-1build2

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "libjs-i18next",
            "binary_version": "23.7.6-1build2"
        },
        {
            "binary_name": "node-i18next",
            "binary_version": "23.7.6-1build2"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-63402.json"

Ubuntu:26.10 / node-i18next

Package

Name: node-i18next
Purl: pkg:deb/ubuntu/node-i18next?arch=source&distro=stonking

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

23.*

23.7.6-1build2

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "libjs-i18next",
            "binary_version": "23.7.6-1build2"
        },
        {
            "binary_name": "node-i18next",
            "binary_version": "23.7.6-1build2"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-63402.json"

Ubuntu:26.04:LTS / node-i18next

Package

Name: node-i18next
Purl: pkg:deb/ubuntu/node-i18next?arch=source&distro=resolute

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

23.*

23.7.6-1build2

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "libjs-i18next",
            "binary_version": "23.7.6-1build2"
        },
        {
            "binary_name": "node-i18next",
            "binary_version": "23.7.6-1build2"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-63402.json"