{"id":"GHSA-xjj6-f33q-929c","summary":"undici vulnerable to Denial of Service via unhandled error on excessive content-encodings","details":"### Impact\n\nundici's `fetch()` 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 (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. The early close then surfaces a content-length mismatch on that orphaned internal 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. undici 6.x, 7.x, and 8.x are affected.\n\n### Patches\n\nUpgrade to `6.29.1`, `7.30.1`, or `8.12.2`. undici now validates the content-encoding chain before creating the internal body stream and aborts the response when the limit is exceeded, so no error can surface on an orphaned stream.\n\n### Workarounds\n\nNone.","aliases":["CVE-2026-109869"],"modified":"2026-10-23T22:30:05.007687918Z","published":"2026-10-23T22:14:31Z","database_specific":{"github_reviewed":true,"github_reviewed_at":"2026-10-23T22:14:31Z","nvd_published_at":"2026-10-15T19:17:21Z","cwe_ids":["CWE-248","CWE-459"],"severity":"HIGH"},"references":[{"type":"WEB","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":"WEB","url":"https://cna.openjsf.org/security-advisories.html"},{"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"}],"affected":[{"package":{"name":"undici","ecosystem":"npm","purl":"pkg:npm/undici"},"ranges":[{"type":"SEMVER","events":[{"introduced":"6.23.0"},{"fixed":"6.29.1"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-xjj6-f33q-929c/GHSA-xjj6-f33q-929c.json"}},{"package":{"name":"undici","ecosystem":"npm","purl":"pkg:npm/undici"},"ranges":[{"type":"SEMVER","events":[{"introduced":"7.18.0"},{"fixed":"7.30.1"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-xjj6-f33q-929c/GHSA-xjj6-f33q-929c.json"}},{"package":{"name":"undici","ecosystem":"npm","purl":"pkg:npm/undici"},"ranges":[{"type":"SEMVER","events":[{"introduced":"8.0.0"},{"fixed":"8.12.2"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-xjj6-f33q-929c/GHSA-xjj6-f33q-929c.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}