{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-109869", "assignerOrgId": "ce714d77-add3-4f53-aff5-83d477b104bb", "state": "PUBLISHED", "assignerShortName": "openjs", "dateReserved": "2026-10-13T08:52:10.454Z", "datePublished": "2026-10-15T18:08:31.243Z", "dateUpdated": "2026-10-15T18:08:31.243Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "ce714d77-add3-4f53-aff5-83d477b104bb", "shortName": "openjs", "dateUpdated": "2026-10-15T18:08:31.243Z"}, "descriptions": [{"lang": "en", "value": "undici is an HTTP client library for Node.js. In versions 6.23.0 through 6.29.0, 7.18.0 through 7.30.0, and 8.0.0 through 8.12.1, its fetch() implementation crashes the Node.js process when a malicious server returns a response with more than five content codings and closes the connection before sending the body. undici rejects such responses because of a content-encoding limit, but it created the internal response stream before that check and returned without attaching an error listener or aborting the request, so the early close surfaces a content-length mismatch on the orphaned stream, which Node.js treats as an unhandled error and terminates the process. A remote, unauthenticated server can trigger this with a single response, even when the application correctly catches the fetch() rejection, resulting in a denial of service. The issue is fixed in undici 6.29.1, 7.30.1, and 8.12.2, and users should upgrade to one of those versions or later. There is no workaround.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "undici is an HTTP client library for Node.js. In versions 6.23.0 through 6.29.0, 7.18.0 through 7.30.0, and 8.0.0 through 8.12.1, its fetch() implementation crashes the Node.js process when a malicious server returns a response with more than five content codings and closes the connection before sending the body. undici rejects such responses because of a content-encoding limit, but it created the internal response stream before that check and returned without attaching an error listener or aborting the request, so the early close surfaces a content-length mismatch on the orphaned stream, which Node.js treats as an unhandled error and terminates the process. A remote, unauthenticated server can trigger this with a single response, even when the application correctly catches the fetch() rejection, resulting in a denial of service. The issue is fixed in undici 6.29.1, 7.30.1, and 8.12.2, and users should upgrade to one of those versions or later. There is no workaround."}]}], "affected": [{"vendor": "undici", "product": "undici", "defaultStatus": "unaffected", "versions": [{"versionType": "semver", "status": "affected", "version": "6.23.0", "lessThan": "6.29.1"}, {"versionType": "semver", "status": "unaffected", "version": "6.29.1"}, {"versionType": "semver", "status": "affected", "version": "7.18.0", "lessThan": "7.30.1"}, {"versionType": "semver", "status": "unaffected", "version": "7.30.1"}, {"versionType": "semver", "status": "affected", "version": "8.0.0", "lessThan": "8.12.2"}, {"versionType": "semver", "status": "unaffected", "version": "8.12.2"}], "packageURL": "pkg:npm/undici"}], "references": [{"url": "https://github.com/nodejs/undici/security/advisories/GHSA-xjj6-f33q-929c"}, {"url": "https://cna.openjsf.org/security-advisories.html"}], "credits": [{"lang": "en", "type": "reporter", "value": "hanityx"}, {"lang": "en", "type": "remediation developer", "value": "mcollina"}, {"lang": "en", "type": "remediation reviewer", "value": "UlisesGascon"}], "title": "undici vulnerable to Denial of Service via unhandled error on excessive content-encodings", "metrics": [{"format": "CVSS", "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-248", "lang": "en", "description": "CWE-248: Uncaught Exception", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-459", "lang": "en", "description": "CWE-459: Incomplete Cleanup", "type": "CWE"}]}], "x_generator": {"engine": "cve-kit 1.0.0"}}}}

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