CVE-2021-44716

There’s an uncontrolled resource consumption flaw in golang’s net/http library in the canonicalHeader() function. An attacker who submits specially crafted requests to applications linked with net/http’s http2 functionality could cause excessive resource consumption that could lead to a denial of service or otherwise impact to system performance and resources.

Mitigation

This flaw can be mitigated by disabling HTTP/2. Setting the GODEBUG=http2server=0 environment variable before calling Serve will disable HTTP/2 unless it was manually configured through the golang.org/x/net/http2 package.