Uncaught Exception Affecting undici package, versions >=4.2.1 <6.29.1>=7.0.0 <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-21181013
- published18 Oct 2026
- disclosed15 Oct 2026
- creditbenzdeus
Introduced: 15 Oct 2026
NewCVE-2026-87018 (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 unhandled ERR_TLS_CERT_ALTNAME_INVALID errors in onHttpSocketError, onHttp2SessionError, and onHttp2SocketError. When a TLS connection is established and the server's certificate fails Subject Alternative Name validation post-connect, the error propagates and triggers a failed assert call, crashing the process. An attacker who can cause the client to connect to a server presenting an invalid TLS certificate can exploit this to crash the Node.js process.