High [CVE-2026-81563] BIND resolver: Denial of Service due to resource exhaustion in SVCB/HTTPS AliasMode processing
This high-severity Red Hat Linux advisory covers CVE-2026-81563; related products: Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 10.
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Summary
BIND resolver: Denial of Service due to resource exhaustion in SVCB/HTTPS AliasMode processing. Red Hat rates this important (CVSS 7.5).
Weakness: CWE-772. 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.
Affected products named by the advisory: Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 10.
- 9.18.0
- 9.18.50
- 9.20.0
- 9.20.27
- 9.21.0
- 9.21.25
- 9.18.11
- 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
- RHSA-2026:75577
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
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