Provide references for CVE-2021-40855.
Where can I find more information about CVE-2021-40855?
References are available at: https://www.consilium.europa.eu/en/policies/coronavirus/eu-digital-covid-certificate/, https://github.com/eu-digital-green-certificates/dgc-overview/security/advisories/GHSA-xcvc-p4fw-qmcj.