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.
References
| Link | Resource |
|---|---|
| https://cna.openjsf.org/security-advisories.html | Vendor Advisory |
| https://github.com/nodejs/undici/security/advisories/GHSA-xjj6-f33q-929c | Vendor Advisory |
Configurations
Configuration 1 (hide)
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History
19 Oct 2026, 20:45
| Type | Values Removed | Values Added |
|---|---|---|
| First Time |
Nodejs
Nodejs undici |
|
| References | () https://cna.openjsf.org/security-advisories.html - Vendor Advisory | |
| References | () https://github.com/nodejs/undici/security/advisories/GHSA-xjj6-f33q-929c - Vendor Advisory | |
| CPE | cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:* |
15 Oct 2026, 19:17
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-10-15 19:17
Updated : 2026-10-19 20:45
NVD link : CVE-2026-109869
Mitre link : CVE-2026-109869
CVE.ORG link : CVE-2026-109869
JSON object : View
Products Affected
nodejs
- undici