vuln-cve/data/2026/1xxx/CVE-2026-1527.json

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    "cveMetadata": {
        "cveId": "CVE-2026-1527",
        "assignerOrgId": "ce714d77-add3-4f53-aff5-83d477b104bb",
        "state": "PUBLISHED",
        "assignerShortName": "openjs",
        "dateReserved": "2026-01-28T12:05:08.491Z",
        "datePublished": "2026-03-12T20:17:18.984Z",
        "dateUpdated": "2026-03-13T18:06:03.794Z"
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            "title": "undici is vulnerable to CRLF Injection via upgrade option",
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                            "lang": "en",
                            "cweId": "CWE-93",
                            "description": "CWE-93 Improper neutralization of CRLF sequences ('CRLF injection')",
                            "type": "CWE"
                        }
                    ]
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            "affected": [
                {
                    "vendor": "undici",
                    "product": "undici",
                    "collectionURL": "https://github.com/nodejs/undici/",
                    "packageName": "undici",
                    "repo": "https://github.com/nodejs/undici/",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "< 6.24.0; 7.0.0 < 7.24.0"
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                        {
                            "status": "unaffected",
                            "version": "6.24.0: 7.24.0"
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            "descriptions": [
                {
                    "lang": "en",
                    "value": "ImpactWhen an application passes user-controlled input to the upgrade option of client.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 upgrade value 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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                            "value": "<h3>Impact</h3><p>When an application passes user-controlled input to the&nbsp;<code>upgrade</code>&nbsp;option of&nbsp;<code>client.request()</code>, an attacker can inject CRLF sequences (<code>\\r\\n</code>) to:</p><ol><li>Inject arbitrary HTTP headers</li><li>Terminate the HTTP request prematurely and smuggle raw data to non-HTTP services (Redis, Memcached, Elasticsearch)</li></ol><p>The vulnerability exists because undici writes the&nbsp;<code>upgrade</code>&nbsp;value directly to the socket without validating for invalid header characters:</p><div><pre>// lib/dispatcher/client-h1.js:1121\nif (upgrade) {\n  header += `connection: upgrade\\r\\nupgrade: ${upgrade}\\r\\n`\n}</pre></div>"
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            "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"
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                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "privilegesRequired": "LOW",
                        "userInteraction": "REQUIRED",
                        "scope": "UNCHANGED",
                        "confidentialityImpact": "LOW",
                        "integrityImpact": "LOW",
                        "availabilityImpact": "NONE",
                        "baseSeverity": "MEDIUM",
                        "baseScore": 4.6,
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N"
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                {
                    "lang": "en",
                    "value": "Matteo Collina",
                    "type": "remediation developer"
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                    "lang": "en",
                    "value": "Ulises Gascón",
                    "type": "remediation developer"
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                    "value": "Raul Vega del Valle",
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            "source": {
                "advisory": "GHSA-4992-7rv2-5pvq",
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                                "timestamp": "2026-03-13T18:05:24.550959Z",
                                "id": "CVE-2026-1527",
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