# CVE-2026-33630

## Summary

- **CVE ID:** CVE-2026-33630
- **Severity:** HIGH
- **CVSS Score:** 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
- **CWE:** CWE-415, CWE-416
- **Published:** Sep 3, 2026
- **Last Modified:** Sep 5, 2026

## 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.

## Affected Products

- c-ares — c-ares (>= 1.32.3, < 1.34.7)

## References

- [CNA](https://github.com/c-ares/c-ares/security/advisories/GHSA-6wfj-rwm7-3542)
- [CNA](https://github.com/c-ares/c-ares/commit/d823199b688052dcdc1646f2ab4cb8c16b1c644a)
- [CNA](https://github.com/c-ares/c-ares/releases/tag/v1.34.7)
- [CNA](https://github.com/c-ares/c-ares/pull/1237)
- [CNA](https://github.com/c-ares/c-ares/commit/1fa3b86a0b8d18fe7b60f3228a01d770feb026bc)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.45%
- **EPSS Percentile:** 38.0

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._