High [CVE-2026-80274] Denial of Service via crafted DNSSEC reply
This high-severity Red Hat Linux advisory covers CVE-2026-80274; related products: Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 10.
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Summary
Denial of Service via crafted DNSSEC reply. Red Hat rates this important (CVSS 7.5).
Weakness: CWE-617. Red Hat lists fixing advisory RHSA-2026:75577 with package bind9.18-32:9.18.29-14.el9_8.10, bind-main-9.20.29-0.1.hum1, bind-32:9.18.33-15.el10_2.12, bind-32:9.16.23-40.el9_8.10.
Affected products named by the advisory: Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 10.
- 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 13 days ago·verify at source
- bind9.18-32:9.18.29-14.el9_8.10
- bind-main-9.20.29-0.1.hum1
- bind-32:9.18.33-15.el10_2.12
- bind-32:9.16.23-40.el9_8.10
- RHSA-2026:75577
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
Mitigation checklist
- To mitigate this issue, disable DNSSEC validation in the BIND resolver configuration. This can be achieved by setting `dnssec-enable no;` and `dnssec-validation no;` within the `options` block in `named.conf` or an included configuration file. A restart of the `named` service is required for the changes to take effect and may impact DNS resolution during the restart. Disabling DNSSEC validation will reduce the security posture of DNS resolution by removing integrity protection for DNS data.
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
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