C-ares is an asynchronous DNS resolver library used by many networking applications to perform non-blocking DNS lookups.
Overview
C-ares is an asynchronous DNS resolver library used by many networking applications to perform non-blocking DNS lookups. It is widely embedded in software stacks and Linux distributions, making its security posture a high-priority concern for defenders. Vulnerabilities in c-ares can impact DNS query handling and, depending on the flaw, may be exploited to disrupt service or compromise components that rely on DNS resolution.
Related Threat Clusters
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Denial of Service Vulnerability in c-ares Affects Ubuntu Releases
A security issue has been identified in the c-ares library affecting Ubuntu 25.10 and 25.04. The vulnerability allows an attacker to cause c-ares to crash by sending specially crafted queries, leading to a denial of…
2 articles · Updated December 11, 2025
Recent Intelligence Reports
- Ubuntu 25.10 USN-7925-1 c — Linuxsecurity · December 11, 2025