UBUNTU-CVE-2026-78301: Medium severity ubuntu/bind9 vulnerability
A malformed zone may contain an NS or DNAME node above its origin, which named treats as a zone cut. If an attacker inserts a malformed zone into a BIND authoritative server (e.g., via zone transfer), queries for names inside the configured zone then lose authoritative status and return an out-of-zone delegation. On a server that also provides recursion BIND can follow this locally sourced cut and cache attacker-supplied data, affecting names outside the configured zone. This situation persists as long as the malformed zone remains in the zone database. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
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ubuntu/bind9to a version that resolves this vulnerability.Fixed in 1:9.9.5.dfsg-3ubuntu0.19+esm15 - Upgrade
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ubuntu/bind9to a version that resolves this vulnerability.Fixed in 1:9.10.3.dfsg.P4-8ubuntu1.19+esm11 - Upgrade
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ubuntu/bind9to a version that resolves this vulnerability.Fixed in 1:9.11.3+dfsg-1ubuntu1.19+esm6 - Upgrade
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ubuntu/bind9to a version that resolves this vulnerability.Fixed in 1:9.18.30-0ubuntu0.20.04.2+esm3 - Upgrade
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ubuntu/bind9to a version that resolves this vulnerability.Fixed in 1:9.18.39-0ubuntu0.22.04.7 - Upgrade
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ubuntu/bind9to a version that resolves this vulnerability.Fixed in 1:9.18.39-0ubuntu0.24.04.8 - Upgrade
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ubuntu/bind9to a version that resolves this vulnerability.Fixed in 1:9.20.24-1ubuntu3.1 - Upgrade
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ubuntu/bind9to a version that resolves this vulnerability.Fixed in 1:9.20.24-1ubuntu0.4