{"id":"CVE-2026-109869","aliases":["GHSA-xjj6-f33q-929c"],"url":"https://o3.security/vulnerability/CVE-2026-109869","summary":"undici vulnerable to Denial of Service via unhandled error on excessive content-encodings","details":"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.","published":"2026-10-15T18:08:31.243Z","modified":"2026-10-24T02:48:40.391733422Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"npm","name":"undici","fixedVersion":"6.29.1"},{"ecosystem":"npm","name":"undici","fixedVersion":"7.30.1"},{"ecosystem":"npm","name":"undici","fixedVersion":"8.12.2"}],"fix":{"url":"https://github.com/nodejs/undici/commit/07ded4941b1e72afec862958c3b8ddf468f3b429","label":"nodejs/undici@07ded49"},"references":[{"type":"ADVISORY","url":"https://cna.openjsf.org/security-advisories.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/109xxx/CVE-2026-109869.json"},{"type":"ADVISORY","url":"https://github.com/nodejs/undici/security/advisories/GHSA-xjj6-f33q-929c"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-109869"},{"type":"WEB","url":"https://github.com/nodejs/undici/commit/07ded4941b1e72afec862958c3b8ddf468f3b429"},{"type":"WEB","url":"https://github.com/nodejs/undici/commit/1325a87dfb3492f8e87e6b0a84b3bda4e82e3436"},{"type":"WEB","url":"https://github.com/nodejs/undici/commit/b5084c7dc239172d75c336b1cd51ddac023938a5"},{"type":"PACKAGE","url":"https://github.com/nodejs/undici"},{"type":"WEB","url":"https://github.com/nodejs/undici/releases/tag/v6.29.1"},{"type":"WEB","url":"https://github.com/nodejs/undici/releases/tag/v7.30.1"},{"type":"WEB","url":"https://github.com/nodejs/undici/releases/tag/v8.12.2"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-24T02:48:40.391733422Z"}}