Provide references for CVE-2021-39206.
Where can I find more information about CVE-2021-39206?
References are available at: https://github.com/envoyproxy/envoy/security/advisories/GHSA-r222-74fw-jqr9, https://github.com/envoyproxy/envoy/security/advisories/GHSA-6g4j-5vrw-2m8h, https://groups.google.com/g/envoy-announce/c/5xBpsEZZDfE/m/wD05NZBbAgAJ, https://github.com/pomerium/pomerium/security/advisories/GHSA-cfc2-wjcm-c8fm.