Medium [CVE-2026-80225] Denial of Service via continuous queries on TCP/DoT connection
This medium-severity Red Hat Linux advisory covers CVE-2026-80225; related products: Red Hat Hardened Images, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6.
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Summary
Denial of Service via continuous queries on TCP/DoT connection. Red Hat rates this moderate (CVSS 5.3).
Weakness: CWE-1050. Red Hat lists fixing advisory RHSA-2026:68590 with package unbound-main-1.26.1-1.hum1.
Affected products named by the advisory: Red Hat Hardened Images; Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; and 4 more.
Affected products named by the advisory: Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat OpenShift Container Platform 4; Red Hat package: unbound.
- 1.26.0
Official advisory · high-confidence parse· fetched 14 days ago·verify at source
- unbound-main-1.26.1-1.hum1
- RHSA-2026:68590
Official advisory · high-confidence parse· fetched 14 days ago·verify at source
Mitigation checklist
- To mitigate this issue, restrict network access to the Unbound DNS resolver to only trusted clients and networks. This can be achieved by configuring firewall rules to limit inbound connections to the Unbound service ports (e.g., TCP port 53 for DNS over TCP, TCP port 853 for DNS over TLS). For example, using `firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source address="<TRUSTED_NETWORK>" port port="53" protocol="tcp" accept'` and `firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source address="<TRUSTED_NETWORK>" port port="853" protocol="tcp" accept'`. After adding rules, apply them with `firewall-cmd --reload`. Replace `<TRUSTED_NETWORK>` with the IP address or network range of trusted clients. Reloading firewall rules may temporarily interrupt network connections.
Official advisory · high-confidence parse· fetched 14 days ago·verify at source
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