usn-8425-1
Vulnerability from osv_ubuntu
Published
2026-06-11 20:54
Modified
2026-06-17 22:06
Summary
libnginx-mod-js vulnerability
Details

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
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-8711",
              "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"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:26.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "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",
            "binary_version": "0.9.4-1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:26.04:LTS",
        "name": "libnginx-mod-js",
        "purl": "pkg:deb/ubuntu/libnginx-mod-js@0.9.4-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.9.4-1ubuntu0.1~esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "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"
      ]
    }
  ],
  "aliases": [],
  "details": "It was discovered that njs did not properly handle certain client-\ncontrolled variables when processing ngx.fetch() requests. An attacker\ncould possibly use this issue to trigger a heap buffer overflow, resulting\nin arbitrary code execution or a denial of service.",
  "id": "USN-8425-1",
  "modified": "2026-06-17T22:06:46Z",
  "published": "2026-06-11T20:54:04Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8425-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-8711"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "libnginx-mod-js vulnerability",
  "upstream": [
    "UBUNTU-CVE-2026-8711"
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.