Zombie linkages are keeping expired domains trusted for years

Help Net Security

May 15, 2026 at 5:00 AM

Overview

Researchers from USC and the University of Twente have identified a significant issue with expired domains, which can continue to hold trust long after they have changed hands. This phenomenon, referred to as 'zombie linkages,' occurs in systems like Web PKI, Maven Central, and Ethereum Name Service. When a domain expires and is transferred to a new owner, the systems still recognize and trust the previous owner, potentially allowing malicious actors to exploit this trust. This lingering trust can create security risks, as users may unknowingly interact with compromised or malicious domains. Addressing this problem is crucial for maintaining the integrity of online systems and protecting users from potential fraud or exploitation.

Key Takeaways

Affected Systems: Web PKI, Maven Central, Ethereum Name Service
Action Required: Implement tighter controls on domain ownership transitions and regularly review trust records for expired domains.
Timeline: Newly disclosed

Original Article Summary

Domains expire, get transferred, and return to the market every day. The systems connected to those domains can continue trusting the original owner long after control has changed. Researchers at USC and the University of Twente examined this problem in three widely used systems: Web PKI, Maven Central, and Ethereum Name Service. They use the term “zombie linkages” to describe lingering trust records that remain active after the original domain owner no longer controls the … More → The post Zombie linkages are keeping expired domains trusted for years appeared first on Help Net Security.

Impact

Web PKI, Maven Central, Ethereum Name Service

Exploitation Status

The exploitation status is currently unknown. Monitor vendor advisories and security bulletins for updates.

Timeline

Newly disclosed

Remediation

Implement tighter controls on domain ownership transitions and regularly review trust records for expired domains.

Additional Information

This threat intelligence is aggregated from trusted cybersecurity sources. For the most up-to-date information, technical details, and official vendor guidance, please refer to the original article linked below.

Related Topics: This incident relates to Exploit.

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