UBUNTU-CVE-2026-19668: Medium severity ubuntu/bind9 vulnerability
A BIND recursive resolver may experience excessive resource consumption if it encounters large numbers of a particular kind of invalid DNSSEC record. Default limits on "max-records-per-type" and "max-types-per-name" help mitigate the exposure. 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.
- Upgrade
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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 - Configuration
Ensure the default limits for max-records-per-type and max-types-per-name are configured to help mitigate excessive resource consumption from large numbers of invalid DNSSEC records.
BIND recursive resolver max-records-per-type and max-types-per-name = default limits