Medium [CVE-2026-82720] Denial of Service via use-after-free in DoH stream cleanup
This medium-severity Red Hat Linux advisory covers CVE-2026-82720; related products: Red Hat Hardened Images, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9.
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Summary
Denial of Service via use-after-free in DoH stream cleanup. Red Hat rates this moderate (CVSS 5.9).
Weakness: CWE-416. 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 9; Red Hat OpenShift Container Platform 4; and 1 more.
Affected products named by the advisory: Red Hat package: unbound.
- 1.12.0
- 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, disable DNS-over-HTTPS (DoH) support in Unbound if it is not required. This can typically be achieved by commenting out or removing the `do-https:` configuration block in the `unbound.conf` file and restarting the Unbound service. Disabling DoH may affect clients relying on this protocol for DNS resolution. A service restart is required for the changes to take effect.
Official advisory · high-confidence parse· fetched 14 days ago·verify at source
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