High [CVE-2026-73508] Denial of Service via Memory Leak in DNS Record Decoder with Malformed Domain Names
This high-severity Red Hat Linux advisory covers CVE-2026-73508 affecting OpenShift Serverless, Red Hat build of Apicurio Registry 3, Red Hat build of Debezium 3.
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Summary
A flaw was found in Netty, an asynchronous network application framework. When processing malformed domain names in DNS packets, the DNS record decoder fails to release allocated memory.
This vulnerability allows an unauthenticated remote attacker to incrementally leak direct memory, eventually leading to a denial of service. Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-772.
Affected Red Hat products: OpenShift Serverless; Red Hat build of Apicurio Registry 3; Red Hat build of Debezium 3; Red Hat Data Grid 8; Red Hat Enterprise Linux AI (RHEL AI) 3; Red Hat JBoss Enterprise Application Platform 7; Red Hat JBoss Enterprise Application Platform 8; Red Hat JBoss Enterprise Application Platform Expansion Pack; Red Hat OpenShift AI (RHOAI); Red Hat OpenShift Dev Spaces; Red Hat Single Sign-On 7.
Red Hat lists Red Hat build of Apache Camel 4 for Quarkus 3; Red Hat build of Apache Camel for Spring Boot 4; Red Hat Build of Keycloak; Red Hat build of Quarkus as not affected. Will not fix / out of support: Red Hat JBoss Enterprise Application Platform 7.
Red Hat does not currently list a fixing RHSA for this CVE.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Mitigation checklist
- Red Hat recommends upgrading to a fixed version as the primary remediation. Where an immediate upgrade is not possible, restrict network access so that only trusted DNS servers and trusted network peers can send DNS traffic to the affected application, using firewall or network policy rules to block or rate-limit DNS traffic from untrusted sources. This reduces exposure to the malformed DNS records that trigger the issue but does not fully eliminate it; upgrading remains the only complete fix.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
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