Detections
Analytics
CVE-2026-78663
critical
Description
The HTTP/2 server can refund connection-level flow control twice for the same data: Once when a client resets a stream (refunding data for any sent-but-unread portion of the stream), and again when a request handler reads the buffered data. A malicious client can exploit this to bypass the configured connection-level flow control limit (MaxReceiveBufferPerConnection). Total buffered data is still limited by the concurrent stream limit and stream-level flow control.
References
https://pkg.go.dev/vuln/GO-2026-6612
https://groups.google.com/g/golang-announce/c/ZPwCyRUuGBs