istioctl-1.29

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• Critical 9.1
  CVE-2026-78663

  Double flow control refund on HTTP/2 server streams in net/http

  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…

  Go standard library golang.org/x/net net/http golang.org/x/net/http2 Debian Ubuntu Azure Linux Alpine Wolfi Go
  Oct 8, 2026
• Critical 9.6
  CVE-2026-39821

  Invoking failure to reject ASCII-only Punycode-encoded labels in golang.org/x/net/idna

  The ToASCII and ToUnicode functions incorrectly accept Punycode-encoded labels that decode to an ASCII-only label. For example, ToUnicode("xn--example-.com") incorrectly returns the name "example.com" rather than an error. This behavior can lead to privilege …

  Go standard library golang.org/x/net net/http net/http/internal/http2 Debian Ubuntu Azure Linux Alpine Wolfi Go
  May 22, 2026
• Critical 9.1
  CVE-2026-33186 Public exploit

  gRPC-Go has an authorization bypass via missing leading slash in :path

  gRPC-Go is the Go language implementation of gRPC. Versions prior to 1.79.3 have an authorization bypass resulting from improper input validation of the HTTP/2 `:path` pseudo-header. The gRPC-Go server was too lenient in its routing logic, accepting requests …

  grpc grpc-go zot kubescape Debian Ubuntu Alpine Wolfi Go
  Mar 20, 2026