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CVE-2026-69186

5.3 · MEDIUM

c-ares is an asynchronous resolver library.

Published Sep 18, 2026CWE-400EPSS 0.47%

Overview

CVE-2026-69186 is a medium-severity vulnerability. It was published on September 18, 2026 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

c-ares is an asynchronous resolver library. Prior to 1.34.7, ares_dns_parse() trusts the attacker-controlled ANCOUNT, NSCOUNT, and ARCOUNT fields before confirming that the DNS response contains enough bytes for the claimed records. Because process_answer() invokes parsing before transaction ID and question validation, a malicious DNS response can cause ares_dns_record_rr_prealloc() and ares_array_set_size() to reserve disproportionate heap memory for a tiny message. Repeated responses create large allocation and release cycles that can degrade or deny name resolution, without causing memory corruption or information disclosure. This issue is fixed in version 1.34.7.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/c-ares/c-ares/commit/e47c203f91cd8b749c8736bc18d75a31ffdec8f4GitHubgithub.com/c-ares/c-ares/commit/eaded4cb200b2a5f8d73f11021ff7c8d6968aaabGitHubgithub.com/c-ares/c-ares/pull/1134GitHubgithub.com/c-ares/c-ares/releases/tag/v1.34.7GitHubgithub.com/c-ares/c-ares/security/advisories/GHSA-jv8r-gqr9-68wjGitHubgithub.com/c-ares/c-ares/security/advisories/GHSA-jv8r-gqr9-68wj

How CyberStrike helps

Frequently asked questions

What is CVE-2026-69186?

CVE-2026-69186 is a medium-severity vulnerability. It was published on September 18, 2026 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2026-69186?

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-69186?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-69186?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-69186 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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