USN-8425-1

It was discovered that njs did not properly handle certain client- controlled variables when processing ngx.fetch() requests. An attacker could possibly use this issue to trigger a heap buffer overflow, resulting in arbitrary code execution or a denial of service.

References

Affected packages

Ubuntu:Pro:26.04:LTS / libnginx-mod-js

Package

Name: libnginx-mod-js
Purl: pkg:deb/ubuntu/libnginx-mod-js?arch=source&distro=esm-apps%2Fresolute

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

0.9.4-1ubuntu0.1~esm1

Affected versions

0.*

0.9.1-1ubuntu2

0.9.1-1ubuntu3

0.9.4-1~build1

0.9.4-1

0.9.4-1build1

0.9.4-1build2

Ecosystem specific

{
    "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_version": "0.9.4-1ubuntu0.1~esm1",
            "binary_name": "libnginx-mod-http-js"
        },
        {
            "binary_version": "0.9.4-1ubuntu0.1~esm1",
            "binary_name": "libnginx-mod-stream-js"
        },
        {
            "binary_version": "0.9.4-1ubuntu0.1~esm1",
            "binary_name": "njs"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8425-1.json"

cves_map

{
    "cves": [
        {
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
                    "type": "CVSS_V4"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ],
            "id": "CVE-2026-8711"
        }
    ],
    "ecosystem": "Ubuntu:Pro:26.04:LTS"
}