UBUNTU-CVE-2026-84394

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Source
https://ubuntu.com/security/CVE-2026-84394
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-84394.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-84394
Upstream
Published
2026-09-04T00:00:00Z
Modified
2026-09-05T06:15:39.873749843Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

fast-uri accepts a host that contains an unbalanced or misplaced authority bracket without reporting an error. A host that starts with an opening bracket but does not end with a closing bracket is neither validated as an IP literal nor canonicalized as a domain name, so parse() returns it as the host with error undefined, while Node's URL and the HTTP clients built on it resolve the same string to a different host. An application that reads the parsed host to make a host decision, such as an SSRF denylist, a redirect allowlist, or proxy routing, and then passes the original URL to an HTTP client evaluates its policy against a string that is not the host the request reaches. The same host is carried through normalize, equal, and resolve. This affects fast-uri versions 2.4.5, 3.1.6, and 4.1.3, and is fixed in 2.4.6, 3.1.7, and 4.1.4, where parse() reports a malformed host for any host that contains a bracket but is not a valid IPv6 literal.

References

Affected packages

Ubuntu:18.04:LTS / node-ajv

Package

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

Affected ranges

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

Affected versions

5.*
5.0.0-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "node-ajv",
            "binary_version": "5.0.0-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-84394.json"

Ubuntu:20.04:LTS / node-ajv

Package

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

Affected ranges

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

Affected versions

6.*
6.10.2-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "node-ajv",
            "binary_version": "6.10.2-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-84394.json"

Ubuntu:22.04:LTS / node-ajv

Package

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

Affected ranges

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

Affected versions

6.*
6.12.6-2
6.12.6-3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "node-ajv",
            "binary_version": "6.12.6-3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-84394.json"

Ubuntu:24.04:LTS / node-ajv

Package

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

Affected ranges

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

Affected versions

6.*
6.12.6-3
8.*
8.12.0~ds+~2.1.1-4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "node-ajv",
            "binary_version": "8.12.0~ds+~2.1.1-4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-84394.json"

Ubuntu:26.04:LTS / node-ajv

Package

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

Affected ranges

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

Affected versions

8.*
8.12.0~ds+~2.1.1-5
8.17.1~ds+~3.0.1+~3.1.0-2
8.17.1~ds+~3.0.1+~3.1.0-4build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "node-ajv",
            "binary_version": "8.17.1~ds+~3.0.1+~3.1.0-4build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-84394.json"