Em resumo
- CVE-2026-78663 é uma vulnerabilidade CRÍTICO (CVSS 9.1) que afeta golang.org/x/net, stdlib.
- Chance de exploração nos próximos 30 dias (EPSS): 0.62%, maior que 49.8% das vulnerabilidades.
- Correção: atualize para 0.60.0, 1.27.2, 1.26.9 ou posterior.
| Package | Affected versions | Patched versions |
|---|
| golang.org/x/net Go | < 0.60.0
| 0.60.0
|
| stdlib Go | ≥ 1.27.0-0, < 1.27.2< 1.26.9
| 1.27.21.26.9
|
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.
NVD 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.
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