undici vulnerable to Denial of Service via unhandled error on excessive content-encodings

{
  "id": "626e1334c79b969e7aba33a6036225567096a2645a33cce90f96d2e8d95f56d2",
  "url": "https://osv.dev/vulnerability/GHSA-xjj6-f33q-929c",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "undici vulnerable to Denial of Service via unhandled error on excessive content-encodings",
    "summary": "### Impact undici's `fetch()` crashes the Node.js process when a malicious server returns a response with more than five content codings and closes the connection before sending the body. undici rejects such responses (a content-encoding limit), but it created the internal response stream before that check and returned without attaching an error listener or aborting the request. The early close then surfaces a content-length mismatch on that orphaned internal stream, which Node.js treats as an unhandled `error` and terminates the process. A remote, unauthenticated server can trigger this with a single response, even when the application correctly catches the `fetch()` rejection. undici 6.x, 7.x, and 8.x are affected. ### Patches Upgrade to `6.29.1`, `7.30.1`, or `8.12.2`. undici now validates the content-encoding chain before creating the internal body stream and aborts the response when the limit is exceeded, so no error can surface on an orphaned stream. ### Workarounds None.",
    "evidence": "osv:GHSA-xjj6-f33q-929c",
    "products": [
      {
        "name": {
          "value": "undici",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.29.1",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "undici",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "7.30.1",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "undici",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "8.12.2",
            "evidence": "/affected/2/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "GHSA-xjj6-f33q-929c",
      "aliases": [
        "CVE-2026-109869",
        "GHSA-xjj6-f33q-929c"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "6.23.0"
                },
                {
                  "fixed": "6.29.1"
                }
              ]
            }
          ],
          "package": {
            "name": "undici",
            "purl": "pkg:npm/undici",
            "ecosystem": "npm"
          },
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-xjj6-f33q-929c/GHSA-xjj6-f33q-929c.json"
          }
        },
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "7.18.0"
                },
                {
                  "fixed": "7.30.1"
                }
              ]
            }
          ],
          "package": {
            "name": "undici",
            "purl": "pkg:npm/undici",
            "ecosystem": "npm"
          },
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-xjj6-f33q-929c/GHSA-xjj6-f33q-929c.json"
          }
        },
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "8.0.0"
                },
                {
                  "fixed": "8.12.2"
                }
              ]
            }
          ],
          "package": {
            "name": "undici",
            "purl": "pkg:npm/undici",
            "ecosystem": "npm"
          },
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-xjj6-f33q-929c/GHSA-xjj6-f33q-929c.json"
          }
        }
      ],
      "modified": "2026-10-23T22:30:05.007687918Z",
      "provider": "osv",
      "references": [
        "https://github.com/nodejs/undici/security/advisories/GHSA-xjj6-f33q-929c",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-109869",
        "https://github.com/nodejs/undici/commit/07ded4941b1e72afec862958c3b8ddf468f3b429",
        "https://github.com/nodejs/undici/commit/1325a87dfb3492f8e87e6b0a84b3bda4e82e3436",
        "https://github.com/nodejs/undici/commit/b5084c7dc239172d75c336b1cd51ddac023938a5",
        "https://cna.openjsf.org/security-advisories.html",
        "https://github.com/nodejs/undici",
        "https://github.com/nodejs/undici/releases/tag/v6.29.1",
        "https://github.com/nodejs/undici/releases/tag/v7.30.1",
        "https://github.com/nodejs/undici/releases/tag/v8.12.2"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-248",
          "CWE-459"
        ],
        "severity": "HIGH",
        "github_reviewed": true,
        "nvd_published_at": "2026-10-15T19:17:21Z",
        "github_reviewed_at": "2026-10-23T22:14:31Z"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-109869",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 427063,
  "published_at": "2026-10-23T22:14:31+00:00"
}