High7.5Red Hat & Ubuntu Linux Updated
Use-after-free / double-free in query-completion handling
CVE-2026-33630 Published Jul 7, 2026Updated by vendor Jul 7, 2026
CVE-2026-33630
Affected products & platforms
Red Hat & Ubuntu LinuxUnclassified
Summary
Use-after-free / double-free in query-completion handling. Red Hat rates this important (CVSS 7.5). Weakness: CWE-416. No fix erratum has been published yet; monitor the Red Hat CVE page and apply the RHSA when released.
Mitigation checklist
Recommended fix / mitigation
- There is no complete mitigation for the remotely-triggered path. As a partial mitigation, use trusted DNS resolvers reached over a trusted transport (e.g., DNS-over-TLS). Avoid calling ares_cancel() from within a query callback to prevent the application-triggered path. Upgrade to c-ares 1.34.7 or later.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
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