| Package | Affected versions | Patched versions |
|---|---|---|
| golang.org/x/net | < 0.23.0 | 0.23.0 |
| golang.org/x/net/http2 | < 0.23.0 | 0.23.0 |
| net/http | ≥ 1.22.0-0, < 1.22.2< 1.21.9 | 1.22.21.21.9 |
| stdlib | ≥ 1.22.0-0, < 1.22.2< 1.21.9 | 1.22.21.21.9 |
An attacker may cause an HTTP/2 endpoint to read arbitrary amounts of header data by sending an excessive number of CONTINUATION frames. Maintaining HPACK state requires parsing and processing all HEADERS and CONTINUATION frames on a connection. When a request's headers exceed MaxHeaderBytes, no memory is allocated to store the excess headers, but they are still parsed. This permits an attacker to cause an HTTP/2 endpoint to read arbitrary amounts of header data, all associated with a request which is going to be rejected. These headers can include Huffman-encoded data which is significantly more expensive for the receiver to decode than for an attacker to send. The fix sets a limit on the amount of excess header frames we will process before closing a connection.
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