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A technical post about how Cloudflare responded to the .de TLD DNSSEC signature failure on May 5, 2026, which caused widespread DNS validation failures.
•DNSSEC establishes a cryptographic chain of trust using digital signatures (RRSIG records) to verify DNS records haven't been tampered with; a broken signature anywhere in the chain causes complete validation failure
•At 19:30 UTC on May 5, 2026, DENIC published incorrect DNSSEC signatures for the .de zone, forcing all validating DNS resolvers including 1.1.1.1 to return SERVFAIL for .de domains
•Cloudflare's 1.1.1.1 resolver mitigated the impact using "serve stale" functionality, continuing to serve cached records past their TTL to cushion users from the outage
•Cloudflare deployed a Negative Trust Anchor (NTA) equivalent mechanism at 22:17 UTC, marking .de as insecure to bypass DNSSEC validation and restore service
•The same mitigation was applied to Cloudflare's internal origin resolver for CDN customers, while Extended DNS Er
This summary was automatically generated by AI based on the original article and may not be fully accurate.
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