node-undici — security advisory

{
  "id": "20f50bc6edff32d8f21e5e0d52a24c956a6a8f73d7e34b0a23abb9c8fa5894fc",
  "url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-84933",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "UBUNTU-CVE-2026-84933",
    "summary": "undici's cache interceptor does not handle the Set-Cookie response header anywhere in its cache path, so it neither refuses to store nor strips that header. In shared cache mode, which is the default, an otherwise cacheable response that carries a Set-Cookie header, for example one marked with a public and max-age directive, is stored and then re-served to a later caller that matches the same cache key. As a result one caller's cookie is disclosed to a different caller, and an untrusted server can inject cookies into cached responses served to all subsequent callers. This violates the requirement that a shared cache must not store cookies. This affects undici versions from 7.0.0 up to 7.29.1 and from 8.0.0 up to 8.10.2. Users should upgrade to undici 7.29.1 or 8.10.2.",
    "evidence": "osv:UBUNTU-CVE-2026-84933",
    "products": [
      {
        "name": {
          "value": "node-undici",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "5.22.1+dfsg1+~cs20.10.10.2-1ubuntu1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "5.26.3+dfsg1+~cs23.10.12-2",
            "evidence": "/affected/0/versions"
          }
        ]
      },
      {
        "name": {
          "value": "node-undici",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "7.18.2+dfsg+~cs3.2.0-1build1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "7.24.6+dfsg+~cs3.2.0-3",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "8.5.0+dfsg+~cs3.2.0-2",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "8.5.0+dfsg+~cs3.2.0-3",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "8.9.0+dfsg+~cs3.2.0-1",
            "evidence": "/affected/1/versions"
          }
        ]
      },
      {
        "name": {
          "value": "node-undici",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "7.3.0+dfsg1+~cs24.12.11-2",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "7.16.0+dfsg+~cs3.2.0-2",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "7.18.2+dfsg+~cs3.2.0-1",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "7.18.2+dfsg+~cs3.2.0-1build1",
            "evidence": "/affected/2/versions"
          }
        ]
      }
    ],
    "severity": "high",
    "structured": {
      "id": "UBUNTU-CVE-2026-84933",
      "aliases": [
        "UBUNTU-CVE-2026-84933"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N"
        },
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N"
        },
        {
          "type": "Ubuntu",
          "score": "medium"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "node-undici",
            "purl": "pkg:deb/ubuntu/node-undici?arch=source&distro=noble",
            "ecosystem": "Ubuntu:24.04:LTS"
          },
          "versions": [
            "5.22.1+dfsg1+~cs20.10.10.2-1ubuntu1",
            "5.26.3+dfsg1+~cs23.10.12-2"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-84933.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "node-llhttp",
                "binary_version": "9.1.3~5.26.3+dfsg1+~cs23.10.12-2"
              },
              {
                "binary_name": "node-undici",
                "binary_version": "5.26.3+dfsg1+~cs23.10.12-2"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "node-undici",
            "purl": "pkg:deb/ubuntu/node-undici?arch=source&distro=stonking",
            "ecosystem": "Ubuntu:26.10"
          },
          "versions": [
            "7.18.2+dfsg+~cs3.2.0-1build1",
            "7.24.6+dfsg+~cs3.2.0-3",
            "8.5.0+dfsg+~cs3.2.0-2",
            "8.5.0+dfsg+~cs3.2.0-3",
            "8.9.0+dfsg+~cs3.2.0-1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-84933.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "node-undici",
                "binary_version": "8.9.0+dfsg+~cs3.2.0-1"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "node-undici",
            "purl": "pkg:deb/ubuntu/node-undici?arch=source&distro=resolute",
            "ecosystem": "Ubuntu:26.04:LTS"
          },
          "versions": [
            "7.3.0+dfsg1+~cs24.12.11-2",
            "7.16.0+dfsg+~cs3.2.0-2",
            "7.18.2+dfsg+~cs3.2.0-1",
            "7.18.2+dfsg+~cs3.2.0-1build1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-84933.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "node-undici",
                "binary_version": "7.18.2+dfsg+~cs3.2.0-1build1"
              }
            ]
          }
        }
      ],
      "modified": "2026-10-17T13:01:13.195919533Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-84933"
      ],
      "references": [
        "https://ubuntu.com/security/CVE-2026-84933",
        "https://www.cve.org/CVERecord?id=CVE-2026-84933",
        "https://github.com/nodejs/undici/security/advisories/GHSA-2jfj-6hjv-fm6j"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-84933",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/1/score"
  },
  "source_id": "core-osv",
  "document_id": 361279,
  "published_at": "2026-09-04T17:17:00+00:00"
}