{"id":"GHSA-4992-7rv2-5pvq","revision":null,"records":[{"revision":"138488f2320b41889d0f75f2535a0c50","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-1527","aliases":[],"title":"undici is vulnerable to CRLF Injection via upgrade option","description":"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}","state":0,"publishedAt":"2026-03-12T20:17:18.984+00:00","modifiedAt":"2026-03-13T18:06:03.794+00:00","affected":[{"ecosystem":"https://github.com/nodejs/undici/","name":"undici","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"undici\",\n                    \"product\": \"undici\",\n                    \"collectionURL\": \"https://github.com/nodejs/undici/\",\n                    \"packageName\": \"undici\",\n                    \"repo\": \"https://github.com/nodejs/undici/\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"< 6.24.0; 7.0.0 < 7.24.0\"\n                        },\n                        {\n                            \"status\": \"unaffected\",\n                            \"version\": \"6.24.0: 7.24.0\"\n                        }\n                    ],\n                    \"defaultStatus\": 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Data Foundation 4.18.27 security, enhancement & bug fix update","vulnerabilityIds":["CVE-2025-61726","CVE-2025-61729","CVE-2025-64718","CVE-2025-68470","CVE-2026-1525","CVE-2026-1526","CVE-2026-1527","CVE-2026-2229","CVE-2026-6321","CVE-2026-6322","CVE-2026-6733","CVE-2026-6734","CVE-2026-9358","CVE-2026-9679","CVE-2026-9697","CVE-2026-11525","CVE-2026-12143","CVE-2026-12151","CVE-2026-13149","CVE-2026-13676","CVE-2026-22036","CVE-2026-25645","CVE-2026-33186","CVE-2026-33349","CVE-2026-33671","CVE-2026-33672","CVE-2026-33750","CVE-2026-34043","CVE-2026-34986","CVE-2026-35469","CVE-2026-39821","CVE-2026-40181","CVE-2026-41305","CVE-2026-41650","CVE-2026-41907","CVE-2026-42342","CVE-2026-45409","CVE-2026-45736","CVE-2026-48779","CVE-2026-48801","CVE-2026-53550","CVE-2026-59869"]}],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-11701","identifiers":["EUVD-2026-11701","CVE-2026-1527","GHSA-4992-7rv2-5pvq"]},"retained":false,"historicalAffected":[]},{"revision":"5c723c1ea599486ab40fe7319def3aee","observedAt":"2026-10-25T05:17:25.909+00:00","statement":{"source":"nvd","id":"CVE-2026-1527","aliases":[],"title":"ImpactWhen an application passes user-controlled input to the\u00A0upgrade\u00A0option of\u00A0client.request(), an attacker can inject CRLF sequences (\\r\\n) to:","description":"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}","state":0,"publishedAt":"2026-03-12T21:16:25.137+00:00","modifiedAt":"2026-06-17T10:16:00.187+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · ce714d77-add3-4f53-aff5-83d477b104bb · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N","score":4.6,"severity":"MEDIUM"}],"references":["https://cna.openjsf.org/security-advisories.html","https://github.com/nodejs/undici/security/advisories/GHSA-4992-7rv2-5pvq","https://hackerone.com/reports/3487198"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-1527","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-93"],"productCriteria":["cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:*"],"sourceDates":{"published":"2026-03-12T21:16:25.137","lastModified":"2026-06-17T10:16:00.187"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-1527","identifiers":["CVE-2026-1527"]},"retained":false,"historicalAffected":[]},{"revision":"3d278988ec9544d79106eafb76ba9abf","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-4992-7rv2-5pvq","aliases":["CVE-2026-1527"],"title":"Undici has CRLF Injection in undici via `upgrade` option","description":"### Impact\n\nWhen an application passes user-controlled input to the `upgrade` option of `client.request()`, an attacker can inject CRLF sequences (`\\r\\n`) to:\n\n1. Inject arbitrary HTTP headers\n2. Terminate the HTTP request prematurely and smuggle raw data to non-HTTP services (Redis, Memcached, Elasticsearch)\n\nThe vulnerability exists because undici writes the `upgrade` value directly to the socket without validating for invalid header characters:\n\n```javascript\n// lib/dispatcher/client-h1.js:1121\nif (upgrade) {\n  header += `connection: upgrade\\r\\nupgrade: ${upgrade}\\r\\n`\n}\n```\n\n### Patches\n\n Patched in the undici version v7.24.0 and v6.24.0. Users should upgrade to this version or later.\n\n### Workarounds\n\nSanitize the `upgrade` option string before passing to undici:\n\n```javascript\nfunction sanitizeUpgrade(value) {\n  if (/[\\r\\n]/.test(value)) {\n    throw new Error('Invalid upgrade value')\n  }\n  return value\n}\n\nclient.request({\n  upgrade: sanitizeUpgrade(userInput)\n})\n```","state":0,"publishedAt":"2026-03-13T20:41:26+00:00","modifiedAt":"2026-09-10T03:50:37.2469207+00:00","affected":[{"ecosystem":"npm","name":"undici","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"6.24.0"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"npm","name":"undici","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"7.0.0"},{"kind":"fixed","version":"7.24.0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/nodejs/undici/security/advisories/GHSA-4992-7rv2-5pvq","https://nvd.nist.gov/vuln/detail/CVE-2026-1527","https://hackerone.com/reports/3487198","https://cna.openjsf.org/security-advisories.html","https://github.com/nodejs/undici"],"sourceUrl":"https://github.com/advisories/GHSA-4992-7rv2-5pvq","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-4992-7rv2-5pvq","identifiers":["GHSA-4992-7rv2-5pvq","CVE-2026-1527"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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