{"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"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-109869.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-109869"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2553656"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-109869"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-109869"},{"url":"https://github.com/nodejs/undici/commit/b5084c7dc239"},{"url":"https://access.redhat.com/errata/RHSA-2026:84706"},{"url":"https://access.redhat.com/errata/RHSA-2026:84657"},{"url":"https://github.com/nodejs/undici/commit/07ded4941b1e72afec862958c3b8ddf468f3b429"},{"url":"https://github.com/nodejs/undici/commit/1325a87dfb3492f8e87e6b0a84b3bda4e82e3436"},{"url":"https://github.com/nodejs/undici/commit/b5084c7dc239172d75c336b1cd51ddac023938a5"},{"url":"https://github.com/nodejs/undici/releases/tag/v6.29.1"},{"url":"https://github.com/nodejs/undici/releases/tag/v7.30.1"},{"url":"https://github.com/nodejs/undici/releases/tag/v8.12.2"},{"url":"https://github.com/advisories/GHSA-xjj6-f33q-929c"}],"tags":["nvd","cve.org","csaf","vex","red-hat","ghsa","npm"],"ingestedAt":"2026-10-15T19:25:46.400Z","ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-10-16T20:05:44.033842Z"},"epss":0.00344,"epssPercentile":0.27738,"patched":["hardened_images"],"aliases":["GHSA-xjj6-f33q-929c"],"ecosystem":"npm","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.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · affected: Exploit Intelligence, Red Hat AMQ Broker 7, Red Hat Ansible Automation Platform 2, Red Hat Build of Podman Desktop, Red Hat Developer Hub, Red Hat Enterprise Linux 10, … · no fix planned: Red Hat Hardened Images, Secrets Management Console for Red Hat OpenShift, Exploit Intelligence, Red Hat AMQ Broker 7, … · updated 2026-10-19 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-109869.json)\n- **RHSA-2026:84706** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-10-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:84706)\n- **RHSA-2026:84657** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-10-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:84657)\n\n## Package advisory (CVE-2026-109869)\n\nAffected packages:\n\n- `undici >= 6.23.0, < 6.29.1`\n- `undici >= 7.18.0, < 7.30.1`\n- `undici >= 8.0.0, < 8.12.2`\n\nPatched in:\n\n- `undici 6.29.1`\n- `undici 7.30.1`\n- `undici 8.12.2`\n\nSource: https://github.com/advisories/GHSA-xjj6-f33q-929c","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}