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It’s always DNS part ∞: tracking down a use-after-free bug in Envoy’s DNS Resolver

calendar_today December 12, 2025 domain pomerium

TL;DR We found a use-after-free bug in Envoy’s DNS resolver, c-ares (CVE-2025-62408, CVE-2025-67514). Impact: Remote Denial of Service via process crash. In certain situations, an attacker could exploit a specific sequence of DNS responses to trigger a heap use-after-free and crash the application.

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