{"id":"CVE-2026-109869","title":"undici is an HTTP client library for Node.js","summary":"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…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-248","CWE-459"],"vendor":"undici","product":"undici","affected":["undici >= 6.23.0 < 6.29.1","undici >= 7.18.0 < 7.30.1","undici >= 8.0.0 < 8.12.2"],"published":"2026-10-15","updated":"2026-10-15","sourceUpdated":"2026-10-15T19:17:21.770","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-109869","references":[{"url":"https://cna.openjsf.org/security-advisories.html","label":"ce714d77-add3-4f53-aff5-83d477b104bb"},{"url":"https://github.com/nodejs/undici/security/advisories/GHSA-xjj6-f33q-929c","label":"ce714d77-add3-4f53-aff5-83d477b104bb"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-10-15T19:25:46.400Z","slug":"CVE-2026-109869","body":"## Overview\n\nundici 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}