UBUNTU-CVE-2026-123605: High severity ubuntu/rust-hickory-proto vulnerability
Hickory DNS hickory-proto 0.1 through 0.25.0-alpha.3 and hickory-net before 0.26.2 contain a DNSSEC validation bypass because the validator verifies an RRSIG against the DNSKEY of whatever name appears in its Signer's Name field without checking that this name is the zone containing the RRset. Attackers controlling any secure zone can produce valid signatures over arbitrary records in unrelated zones, which resolvers, recursors, and clients using DnssecDnsHandle accept as authenticated.
Affected Software
Event History
Frequently Asked Questions
Which deployments are exposed to this validation bypass?
Resolvers, recursors, and clients that use DnssecDnsHandle are affected if they use vulnerable hickory-proto or hickory-net versions. The listed Ubuntu software packages are rust-hickory-proto and rust-hickory-net.
What does an attacker need to exploit the issue?
The attacker needs control of any secure DNS zone. They can create valid signatures over records for unrelated zones and rely on the affected validator accepting those records as authenticated.
What is the security impact if exploitation succeeds?
An attacker can bypass DNSSEC validation for arbitrary records in unrelated zones. The reported impact includes high confidentiality, integrity, and availability effects.