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              "content": {
                "id": "CVE-2026-1527",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
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                "timestamp": "2026-03-13T18:05:24.550959Z",
                "version": "2.0.3"
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://github.com/nodejs/undici/",
          "defaultStatus": "unaffected",
          "packageName": "undici",
          "product": "undici",
          "repo": "https://github.com/nodejs/undici/",
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              "status": "affected",
              "version": "\u003c 6.24.0; 7.0.0 \u003c 7.24.0"
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              "status": "unaffected",
              "version": "6.24.0: 7.24.0"
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      "credits": [
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Matteo Collina"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Ulises Gasc\u00f3n"
        },
        {
          "lang": "en",
          "type": "analyst",
          "value": "Raul Vega del Valle"
        }
      ],
      "descriptions": [
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              "value": "\u003ch3\u003eImpact\u003c/h3\u003e\u003cp\u003eWhen an application passes user-controlled input to the\u0026nbsp;\u003ccode\u003eupgrade\u003c/code\u003e\u0026nbsp;option of\u0026nbsp;\u003ccode\u003eclient.request()\u003c/code\u003e, an attacker can inject CRLF sequences (\u003ccode\u003e\\r\\n\u003c/code\u003e) to:\u003c/p\u003e\u003col\u003e\u003cli\u003eInject arbitrary HTTP headers\u003c/li\u003e\u003cli\u003eTerminate the HTTP request prematurely and smuggle raw data to non-HTTP services (Redis, Memcached, Elasticsearch)\u003c/li\u003e\u003c/ol\u003e\u003cp\u003eThe vulnerability exists because undici writes the\u0026nbsp;\u003ccode\u003eupgrade\u003c/code\u003e\u0026nbsp;value directly to the socket without validating for invalid header characters:\u003c/p\u003e\u003cdiv\u003e\u003cpre\u003e// lib/dispatcher/client-h1.js:1121\nif (upgrade) {\n  header += `connection: upgrade\\r\\nupgrade: ${upgrade}\\r\\n`\n}\u003c/pre\u003e\u003c/div\u003e"
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          "value": "ImpactWhen an application passes user-controlled input to the\u00a0upgrade\u00a0option of\u00a0client.request(), an attacker can inject CRLF sequences (\\r\\n) to:\n\n  *  Inject arbitrary HTTP headers\n  *  Terminate the HTTP request prematurely and smuggle raw data to non-HTTP services (Redis, Memcached, Elasticsearch)\nThe vulnerability exists because undici writes the\u00a0upgrade\u00a0value directly to the socket without validating for invalid header characters:\n\n// lib/dispatcher/client-h1.js:1121\nif (upgrade) {\n  header += `connection: upgrade\\r\\nupgrade: ${upgrade}\\r\\n`\n}"
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            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 4.6,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N",
            "version": "3.1"
          },
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          "scenarios": [
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              "lang": "en",
              "value": "GENERAL"
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          ]
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      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-93",
              "description": "CWE-93 Improper neutralization of CRLF sequences (\u0027CRLF injection\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-12T20:17:18.984Z",
        "orgId": "ce714d77-add3-4f53-aff5-83d477b104bb",
        "shortName": "openjs"
      },
      "references": [
        {
          "url": "https://github.com/nodejs/undici/security/advisories/GHSA-4992-7rv2-5pvq"
        },
        {
          "url": "https://hackerone.com/reports/3487198"
        },
        {
          "url": "https://cna.openjsf.org/security-advisories.html"
        }
      ],
      "source": {
        "advisory": "GHSA-4992-7rv2-5pvq",
        "discovery": "EXTERNAL"
      },
      "title": "undici is vulnerable to CRLF Injection via upgrade option",
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    "cveId": "CVE-2026-1527",
    "datePublished": "2026-03-12T20:17:18.984Z",
    "dateReserved": "2026-01-28T12:05:08.491Z",
    "dateUpdated": "2026-03-13T18:06:03.794Z",
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