{"id":"GHSA-xjj6-f33q-929c","revision":"2a40b1dbb46d4feb927c57d3c353ede0","records":[{"revision":"2a40b1dbb46d4feb927c57d3c353ede0","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-xjj6-f33q-929c","aliases":["CVE-2026-109869"],"title":"undici vulnerable to Denial of Service via unhandled error on excessive content-encodings","description":"### 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.","state":0,"publishedAt":"2026-10-23T22:14:31+00:00","modifiedAt":"2026-10-23T22:30:05.0076879+00:00","affected":[{"ecosystem":"npm","name":"undici","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"6.23.0"},{"kind":"fixed","version":"6.29.1"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"npm","name":"undici","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"7.18.0"},{"kind":"fixed","version":"7.30.1"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"npm","name":"undici","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"8.0.0"},{"kind":"fixed","version":"8.12.2"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/nodejs/undici/security/advisories/GHSA-xjj6-f33q-929c","https://nvd.nist.gov/vuln/detail/CVE-2026-109869","https://github.com/nodejs/undici/commit/07ded4941b1e72afec862958c3b8ddf468f3b429","https://github.com/nodejs/undici/commit/1325a87dfb3492f8e87e6b0a84b3bda4e82e3436","https://github.com/nodejs/undici/commit/b5084c7dc239172d75c336b1cd51ddac023938a5","https://cna.openjsf.org/security-advisories.html","https://github.com/nodejs/undici","https://github.com/nodejs/undici/releases/tag/v6.29.1","https://github.com/nodejs/undici/releases/tag/v7.30.1","https://github.com/nodejs/undici/releases/tag/v8.12.2"],"sourceUrl":"https://github.com/advisories/GHSA-xjj6-f33q-929c","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-xjj6-f33q-929c","identifiers":["GHSA-xjj6-f33q-929c","CVE-2026-109869"]},"retained":false,"historicalAffected":[]}],"coverage":[]}