Description (CNA)
Http4s is a Scala interface for HTTP services. Prior to 0.23.37 and 1.0.0-M48, Ember’s HTTP/2 read loop parses a frame’s 24-bit declared length but waits to buffer the entire payload before comparing it with SETTINGS_MAX_FRAME_SIZE. An unauthenticated peer can declare a payload near 16 MiB on a connection where Ember advertised 16 KiB and either complete or slowly stream it, causing up to 1024-fold memory amplification per connection before processFrame can reject the frame. The shared H2Connection.readLoop affects withHttp2 servers and clients, while HTTP/2-disabled configurations are unaffected, and the patch rejects oversized frames before buffering their payloads. This issue is fixed in versions 0.23.37 and 1.0.0-M48.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| http4s / http4s | affected < 0.23.37; affected >= 1.0.0-M1, < 1.0.0-M48 |
CWE
CWE-400
References
- https://github.com/http4s/http4s/security/advisories/GHSA-gq9p-f254-h286
- https://github.com/http4s/http4s/commit/87cf334fa3f608ef7d3eb359e71e037ba3336d29
- https://github.com/http4s/http4s/releases/tag/v0.23.37
- https://github.com/http4s/http4s/releases/tag/v1.0.0-M48
ADP enrichment
No English description supplied.
No references supplied.