Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Go standard library / net/http | affected 0 before 1.26.9 |
| Go standard library / net/http/internal/http2 | affected 1.27.0-0 before 1.27.2 |
| golang.org/x/net / golang.org/x/net/http2 | affected 0 before 0.60.0 |
CWE
No CWE identifiers supplied.
References
- https://go.dev/cl/847187
- https://go.dev/cl/847310
- https://go.dev/issue/81743
- https://groups.google.com/g/golang-announce/c/U2fTuyDJznI
- https://groups.google.com/g/golang-announce/c/ZPwCyRUuGBs
- https://pkg.go.dev/vuln/GO-2026-6612
ADP enrichment
No English description supplied.
No references supplied.