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CVE-2026-85024

Estado: AnalizadaMedia (5.9)—

undici bundles a WebSocket client whose permessage-deflate size-limit cleanup removes all listeners from the internal zlib inflate stream, including its error listener, while that stream can still emit. When a remote peer sends a compressed payload that crosses the built-in 128 MiB decompressed-payload limit and then contains a malformed DEFLATE byte, the inflate stream emits a data error with no listener attached, which Node.js treats as a fatal unhandled error and terminates the entire process.

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Exploitation is remote and unauthenticated, requires no application mistake, and is asymmetric, since roughly 130 KB on the wire expands past the limit and crashes the process, and reconnecting can repeat the crash. This affects undici versions from 6.25.0 up to 6.28.1, from 7.28.0 up to 7.29.1, and from 8.1.0 up to 8.10.2. Users should upgrade to undici 6.28.1, 7.29.1, or 8.10.2.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Nodejs — Undici

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-85024",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-85024",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-09-04T19:30:33.342541Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "ce714d77-add3-4f53-aff5-83d477b104bb",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.9,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 2.2
      }
    ]
  },
  "affected": [
    {
      "source": "ce714d77-add3-4f53-aff5-83d477b104bb",
      "affectedData": [
        {
          "vendor": "undici",
          "product": "undici",
          "versions": [
            {
              "status": "affected",
              "version": "6.25.0",
              "lessThan": "6.28.1",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.28.1",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "7.28.0",
              "lessThan": "7.29.1",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "7.29.1",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "8.1.0",
              "lessThan": "8.10.2",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "8.10.2",
              "versionType": "semver"
            }
          ],
          "packageURL": "pkg:npm/undici",
          "defaultStatus": "unaffected"
        }
      ]
    }
  ],
  "published": "2026-09-04T17:17:02.590",
  "references": [
    {
      "url": "https://cna.openjsf.org/security-advisories.html",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "ce714d77-add3-4f53-aff5-83d477b104bb"
    },
    {
      "url": "https://github.com/nodejs/undici/security/advisories/GHSA-3wwx-pv8p-q78v",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "ce714d77-add3-4f53-aff5-83d477b104bb"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "ce714d77-add3-4f53-aff5-83d477b104bb",
      "description": [
        {
          "lang": "en",
          "value": "CWE-248"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "undici bundles a WebSocket client whose permessage-deflate size-limit cleanup removes all listeners from the internal zlib inflate stream, including its error listener, while that stream can still emit. When a remote peer sends a compressed payload that crosses the built-in 128 MiB decompressed-payload limit and then contains a malformed DEFLATE byte, the inflate stream emits a data error with no listener attached, which Node.js treats as a fatal unhandled error and terminates the entire process. Exploitation is remote and unauthenticated, requires no application mistake, and is asymmetric, since roughly 130 KB on the wire expands past the limit and crashes the process, and reconnecting can repeat the crash. This affects undici versions from 6.25.0 up to 6.28.1, from 7.28.0 up to 7.29.1, and from 8.1.0 up to 8.10.2. Users should upgrade to undici 6.28.1, 7.29.1, or 8.10.2."
    }
  ],
  "lastModified": "2026-09-16T20:41:46.040",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:*",
              "vulnerable": true,
              "matchCriteriaId": "895D0787-A331-47B7-96B4-8EF0C6ABBBF2",
              "versionEndExcluding": "6.28.1",
              "versionStartIncluding": "6.25.0"
            },
            {
              "criteria": "cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:*",
              "vulnerable": true,
              "matchCriteriaId": "B77ED024-C1A6-435F-BCDD-B8854F92D08D",
              "versionEndExcluding": "7.29.1",
              "versionStartIncluding": "7.28.0"
            },
            {
              "criteria": "cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:*",
              "vulnerable": true,
              "matchCriteriaId": "840E2CC0-528C-41BC-8DCF-04D4BE5EC10F",
              "versionEndExcluding": "8.10.2",
              "versionStartIncluding": "8.1.0"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "ce714d77-add3-4f53-aff5-83d477b104bb"
}