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CVE-2026-33630

7.5 · HIGH

c-ares is an asynchronous resolver library.

Published Sep 3, 2026CWE-415EPSS 0.84%

Overview

CVE-2026-33630 is a high-severity vulnerability. It was published on September 3, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. 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. From ver 1.32.3 until 1.34.7, a use-after-free / double-free in c-ares' query-completion handling. The same flaw — a query's callback being invoked while the query is still linked in the channel's internal lookup structures — is present at multiple points in the resend/finish path (timeout handling, response handling, and query dispatch). If the query, or for ares_getaddrinfo() the owning host_query, is freed as a side effect of that callback, it is then accessed and/or freed a second time. This vulnerability is fixed in ver 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/1fa3b86a0b8d18fe7b60f3228a01d770feb026bcGitHubgithub.com/c-ares/c-ares/commit/d823199b688052dcdc1646f2ab4cb8c16b1c644aGitHubgithub.com/c-ares/c-ares/pull/1237GitHubgithub.com/c-ares/c-ares/releases/tag/v1.34.7GitHubgithub.com/c-ares/c-ares/security/advisories/GHSA-6wfj-rwm7-3542

How CyberStrike helps

Frequently asked questions

What is CVE-2026-33630?

CVE-2026-33630 is a high-severity vulnerability. It was published on September 3, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-33630?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-33630?

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-2026-33630?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-33630 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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