CVEvulnerability
CVE-2026-78663
9.1 CRITICAL
Official page ↗
- Status
- Awaiting Analysis
- Published
- 2026-10-08
- Last modified
- 2026-10-09
- Assigner
- [email protected]
- CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
- 9.1 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
- Weaknesses
- CWE-675
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.
Related
Weakness · CWE (1)
- CWE-675 Multiple Operations on Resource in Single-Operation Context weakness
References
- https://go.dev/cl/847187 go.dev
- https://go.dev/cl/847310 go.dev
- https://go.dev/issue/81743 go.dev
- https://groups.google.com/g/golang-announce/c/U2fTuyDJznI groups.google.com
- https://groups.google.com/g/golang-announce/c/ZPwCyRUuGBs groups.google.com
- https://pkg.go.dev/vuln/GO-2026-6612 pkg.go.dev