CVE-2023-45288

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.

Bugs

• <https://go.dev/issue/65051&gt;

Notes