Medium [CVE-2026-78301] DNS cache poisoning via malformed zone insertion
This medium-severity Red Hat Linux advisory covers CVE-2026-78301; related products: Red Hat Hardened Images, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7.
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Summary
DNS cache poisoning via malformed zone insertion. Red Hat rates this moderate (CVSS 5.8).
Weakness: CWE-168. Red Hat lists fixing advisory RHSA-2026:68279 with package bind-main-9.20.29-0.1.hum1.
Affected products named by the advisory: Red Hat Hardened Images; Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; and 4 more.
Affected products named by the advisory: Red Hat Enterprise Linux 9; Red Hat OpenShift Container Platform 4; Red Hat package: bind9.16; Red Hat package: bind9.18.
- 9.11.0
- 9.18.50
- 9.20.0
- 9.20.27
- 9.21.0
- 9.21.25
- 9.11.3
- 9.20.9
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
- bind-main-9.20.29-0.1.hum1
- RHSA-2026:68279
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
Mitigation checklist
- To mitigate this issue, Red Hat recommends separating authoritative and recursive DNS functions onto different BIND instances or servers. This prevents a compromised authoritative zone from affecting recursive queries. Additionally, restrict zone transfer sources to trusted hosts only by configuring `allow-transfer` directives within your `named.conf` zone definitions. After modifying `named.conf`, the BIND service must be reloaded for changes to take effect, which may temporarily interrupt DNS resolution.
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
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