Uncaught Exception Affecting undici package, versions >=6.23.0 <6.29.1>=7.18.0 <7.30.1>=8.0.0 <8.12.2
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-UNDICI-21185768
- published18 Oct 2026
- disclosed15 Oct 2026
- credithanityx
Introduced: 15 Oct 2026
NewCVE-2026-109869 (opens in a new tab)How to fix?
Upgrade undici to version 6.29.1, 7.30.1, 8.12.2 or higher.
Overview
undici is an An HTTP/1.1 client, written from scratch for Node.js
Affected versions of this package are vulnerable to Uncaught Exception via excessive Content-Encoding headers in an HTTP response processed by httpNetworkFetch in lib/web/fetch/index.js. A server returning a response with more than five content-encoding layers triggers an error path that previously called reject() before the response body Readable stream was initialised, leaving the stream in an inconsistent state and crashing the client process.