High [CVE-2026-33630] Use-after-free / double-free in query-completion handling
This high-severity Red Hat Linux advisory covers CVE-2026-33630 affecting Red Hat Enterprise Linux 1.
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Summary
Use-after-free / double-free in query-completion handling. Red Hat rates this important (CVSS 7.5).
Weakness: CWE-416. Red Hat lists fixing advisory RHSA-2026:42096 with package c-ares-0:1.34.6-2.el10_2, c-ares-main-1.34.7-1.hum1.
Affected product named by the advisory: Red Hat Enterprise Linux 1.
- before 1.34.7
Official advisory · high-confidence parse· fetched 1 month ago·verify at source
- c-ares-0:1.34.6-2.el10_2
- c-ares-main-1.34.7-1.hum1
- RHSA-2026:42096
Official advisory · high-confidence parse· fetched 1 month ago·verify at source
Mitigation checklist
- 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 1 month ago·verify at source
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