CVE-2026-78663

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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Produits concernés

• Go standard library net/http
• Go standard library net/http/internal/http2
• golang.org/x/net/http2

Scores CVSS

Faiblesses (CWE)

• CWE-675

Références

• 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

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories