CVE-2026-109869

{
  "id": "CVE-2026-109869",
  "sourceIdentifier": "ce714d77-add3-4f53-aff5-83d477b104bb",
  "published": "2026-10-15T19:17:21.770",
  "lastModified": "2026-10-19T20:45:20.340",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "undici is an HTTP client library for Node.js. In versions 6.23.0 through 6.29.0, 7.18.0 through 7.30.0, and 8.0.0 through 8.12.1, its fetch() implementation 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 because of 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, so the early close surfaces a content-length mismatch on the orphaned 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, resulting in a denial of service. The issue is fixed in undici 6.29.1, 7.30.1, and 8.12.2, and users should upgrade to one of those versions or later. There is no workaround."
    }
  ],
  "affected": [
    {
      "source": "ce714d77-add3-4f53-aff5-83d477b104bb",
      "affectedData": [
        {
          "vendor": "undici",
          "product": "undici",
          "defaultStatus": "unaffected",
          "packageURL": "pkg:npm/undici",
          "versions": [
            {
              "version": "6.23.0",
              "lessThan": "6.29.1",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "6.29.1",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.18.0",
              "lessThan": "7.30.1",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "7.30.1",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "8.0.0",
              "lessThan": "8.12.2",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "8.12.2",
              "versionType": "semver",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "ce714d77-add3-4f53-aff5-83d477b104bb",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-10-16T20:05:44.033842Z",
          "id": "CVE-2026-109869",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "ce714d77-add3-4f53-aff5-83d477b104bb",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-248"
        },
        {
          "lang": "en",
          "value": "CWE-459"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:*",
              "versionStartIncluding": "6.23.0",
              "versionEndExcluding": "6.29.1",
              "matchCriteriaId": "5A75F27F-9451-423A-BAA3-B1AE1EB79D55"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:*",
              "versionStartIncluding": "7.18.0",
              "versionEndExcluding": "7.30.1",
              "matchCriteriaId": "64B58167-260D-400F-ACA5-E0DA0B6FA2E0"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:*",
              "versionStartIncluding": "8.0.0",
              "versionEndExcluding": "8.12.2",
              "matchCriteriaId": "58E7E81B-786E-47BB-BD33-DAADED999225"
            }
          ]
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  ],
  "references": [
    {
      "url": "https://cna.openjsf.org/security-advisories.html",
      "source": "ce714d77-add3-4f53-aff5-83d477b104bb",
      "tags": [
        "Vendor Advisory"
      ]
    },
    {
      "url": "https://github.com/nodejs/undici/security/advisories/GHSA-xjj6-f33q-929c",
      "source": "ce714d77-add3-4f53-aff5-83d477b104bb",
      "tags": [
        "Vendor Advisory"
      ]
    }
  ]
}