{"dataType": "CVE_RECORD", "dataVersion": "5.2", "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"}, "containers": {"cna": {"providerMetadata": {"orgId": "ce714d77-add3-4f53-aff5-83d477b104bb", "shortName": "openjs", "dateUpdated": "2026-03-12T20:17:18.984Z"}, "title": "undici is vulnerable to CRLF Injection via upgrade option", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-93", "description": "CWE-93 Improper neutralization of CRLF sequences ('CRLF injection')", "type": "CWE"}]}], "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"}, {"status": "unaffected", "version": "6.24.0: 7.24.0"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "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}", "supportingMedia": [{"type": "text/html", "base64": false, "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>"}]}], "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"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "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"}}], "credits": [{"lang": "en", "value": "Matteo Collina", "type": "remediation developer"}, {"lang": "en", "value": "Ulises Gasc\u00f3n", "type": "remediation developer"}, {"lang": "en", "value": "Raul Vega del Valle", "type": "analyst"}], "source": {"advisory": "GHSA-4992-7rv2-5pvq", "discovery": "EXTERNAL"}, "x_generator": {"engine": "Vulnogram 1.0.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-03-13T18:05:24.550959Z", "id": "CVE-2026-1527", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-03-13T18:06:03.794Z"}}]}}

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{"cveTags": [], "descriptions": [{"lang": "en", "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}"}, {"lang": "es", "value": "ImpactoCuando una aplicaci\u00f3n pasa entrada controlada por el usuario a la opci\u00f3n upgrade de client.request(), un atacante puede inyectar secuencias CRLF (\\r\\n) para:\n\n * Inyectar encabezados HTTP arbitrarios\n * Terminar la solicitud HTTP prematuramente y contrabandear datos sin procesar a servicios no HTTP (Redis, Memcached, Elasticsearch)\nLa vulnerabilidad existe porque undici escribe el valor upgrade directamente al socket sin validar caracteres de encabezado no v\u00e1lidos:\n\n// lib/dispatcher/client-h1.js:1121\nif (upgrade) {\n header += `connection: upgrade\\r\\nupgrade: ${upgrade}\\r\\n`\n}"}], "id": "CVE-2026-1527", "lastModified": "2026-03-13T20:06:54.667", "metrics": {"cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 2.1, "impactScore": 2.5, "source": "ce714d77-add3-4f53-aff5-83d477b104bb", "type": "Secondary"}]}, "published": "2026-03-12T21:16:25.137", "references": [{"source": "ce714d77-add3-4f53-aff5-83d477b104bb", "url": "https://cna.openjsf.org/security-advisories.html"}, {"source": "ce714d77-add3-4f53-aff5-83d477b104bb", "url": "https://github.com/nodejs/undici/security/advisories/GHSA-4992-7rv2-5pvq"}, {"source": "ce714d77-add3-4f53-aff5-83d477b104bb", "url": "https://hackerone.com/reports/3487198"}], "sourceIdentifier": "ce714d77-add3-4f53-aff5-83d477b104bb", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-93"}], "source": "ce714d77-add3-4f53-aff5-83d477b104bb", "type": "Secondary"}]}

{"bugzilla": {"description": "undici: Undici: HTTP header injection and request smuggling vulnerability", "id": "2447141", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2447141"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L", "status": "draft"}, "cwe": "CWE-93", "details": ["A flaw was found in undici, a Node.js HTTP/1.1 client. This vulnerability allows a remote attacker to inject malicious data into HTTP headers or prematurely end HTTP requests by sending specially crafted input to the `upgrade` option of `client.request()`. This is possible because undici does not properly validate input for invalid header characters, which could lead to unauthorized information disclosure or bypassing of security controls."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2026-1527", "package_state": [{"cpe": "cpe:/a:redhat:cryostat:4", "fix_state": "Fix deferred", "package_name": "io.cryostat-cryostat", "product_name": "Cryostat 4"}, {"cpe": "cpe:/a:redhat:openshift_lightspeed", "fix_state": "Fix deferred", "package_name": "openshift-lightspeed/lightspeed-console-plugin-pf5-rhel9", "product_name": "OpenShift Lightspeed"}, {"cpe": "cpe:/a:redhat:openshift_lightspeed", "fix_state": "Fix deferred", "package_name": "openshift-lightspeed/lightspeed-console-plugin-rhel9", 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{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,6.24.0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[7.0.0,7.24.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.24.0,7.24.0]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "undici", "source": "cna", "vendor": "undici"}, "product": "undici", "vendor": "undici"}], "created": "2026-03-13T09:49:50.236277+00:00", "updated": "2026-03-13T09:49:50.236472+00:00", "vendors": ["undici", "undici$PRODUCT$undici"]}