undici is an HTTP client library for Node.js. In versions 7.15.0 through 7.30.0 and 8.0.0 through 8.12.1, its decompress interceptor forwards decompressed response data to the downstream handler from zlib stream event callbacks without catching exceptions those callbacks may throw, and while undicis engine converts a synchronous throw from a downstream handler into a per-request failure, that protection is absent when the throw happens asynchronously from a zlib callback. As a result, a downstream handler that throws by design, such as the built-in dump interceptor which throws when a response exceeds its configured maximum size, escapes as an uncaught exception that terminates the Node.js process. A malicious or compromised HTTP server can crash any client that composes the decompress interceptor with such a handler by returning a small compressed body that decompresses to more than the configured limit, so only the decompressed size matters and the bytes on the wire stay tiny. The issue is fixed in undici 7.30.1 and 8.12.2, and users should upgrade to one of those versions or later. As a workaround, avoid composing the decompress interceptor with a response handler that throws during response processing until upgrading.
Weakness
An exception is thrown from a function, but it is not caught.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Undici | Nodejs | 7.15.0 (including) | 7.30.1 (excluding) |
| Undici | Nodejs | 8.0.0 (including) | 8.12.2 (excluding) |
| Red Hat Hardened Images | RedHat | nodejs26-main-11.20.0-1.26.11.1.0.4.hum1 | * |
| Red Hat Hardened Images | RedHat | nodejs26-main-26.11.1-0.4.hum1 | * |
| Red Hat Hardened Images | RedHat | nodejs24-main-11.19.0-1.24.21.0.1.5.hum1 | * |
| Red Hat Hardened Images | RedHat | nodejs24-main-24.21.0-1.5.hum1 | * |
| Node-undici | Ubuntu | upstream | * |