~ / search / GHSA-2gqq-gqf2-x968

GHSA-2gqq-gqf2-x968

undici vulnerable to response truncation via oversized chunked responses in the dump interceptor

Source: GitHub Advisory Database (reviewed) Low CVE-2026-84947

Packages

EcosystemPackageAffectedFixed in
npm undici >= 7.1.0, < 7.29.1 7.29.1
npm undici >= 8.0.0, < 8.10.2 8.10.2

Details

As written in the advisory (Markdown source, shown as plain text).

### Impact undici's `interceptors.dump()` reads and discards response bodies up to a configurable `maxSize`. When a response declares a `Content-Length` that exceeds `maxSize`, the request is aborted cleanly. When a response is sent chunked (no `Content-Length`) and its body exceeds `maxSize`, it is not aborted: the interceptor ends the response early once the accumulated size reaches `maxSize`, and continued delivery from the parser triggers an internal assertion that is caught and turned into a request abort and connection tear-down. The application observes a misleading `200` with an empty or truncated body while the connection is disconnected. Any application using the dump interceptor against untrusted or misbehaving upstreams is affected. ### Patches Upgrade to `7.29.1` or `8.10.2`. The dump interceptor now enforces `maxSize` on both the declared and the received body size, aborting the request with a `RequestAbortedError` instead of returning a truncated response. ### Workarounds None. Avoid using `interceptors.dump()` with untrusted upstreams until upgraded.

References

External links from the advisory. They lead to third-party sites.