On May 5, 2026, at roughly 19:30 UTC, DENIC, the registry operator for the.de country-code top-level domain (TLD), started publishing incorrect DNSSEC signatures for the.de zone. Any validating DNS resolver receiving these signatures was required by the DNSSEC specification to reject them and return SERVFAIL to clients, including 1.1.1.1, the public DNS resolver operated by Cloudflare. The country-code top-level domain for Germany, .de, is one of the largest on the Internet.