# SUSE-SU-2026:4021-1: c-ares security update

SUSE-SU-2026:4021-1, released September 7, 2026, fixes 6 CVEs in c-ares (version 1.34.8-150000.3.29.1). None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/suse-su-2026-4021-1
- Platform: Linux
- Released: Sep 7, 2026
- Priority: High (Closes CVE-2026-33630, high severity)
- CVEs: 6, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://osv.dev/vulnerability/SUSE-SU-2026:4021-1

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [c-ares](https://patchblox.com/security/data/product/linux/c-ares.md) | sles 15.6 | 1.34.8-150000.3.29.1 |
| [c-ares](https://patchblox.com/security/data/product/linux/c-ares.md) | sles 15.7 | 1.34.8-150000.3.29.1 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-33630](https://patchblox.com/security/data/cve/CVE-2026-33630.md) | High | c-ares : Use-after-free / double-free in c-ares query-completion handling, remotely triggerable via ares_getaddrinfo() over TCP | 7.5 | 0.0085 |  |
| [CVE-2025-31498](https://patchblox.com/security/data/cve/CVE-2025-31498.md) | High | c-ares: use-after-free in read_answers() when process_answer() may re-enqueue a query (bsc#1240955). | 7.3 | 0.0060 |  |
| [CVE-2026-69184](https://patchblox.com/security/data/cve/CVE-2026-69184.md) | High | c-ares: CPU-exhaustion denial of service via unbounded DNS name compression pointer chains | 7.5 | 0.0048 |  |
| [CVE-2024-25629](https://patchblox.com/security/data/cve/CVE-2024-25629.md) | High | c-ares: out of bounds read in ares__read_line() (bsc#1220279). | 7.5 | 0.0035 |  |
| [CVE-2026-69186](https://patchblox.com/security/data/cve/CVE-2026-69186.md) | Routine | c-ares: Memory-amplification denial of service via unvalidated DNS header record counts | 5.3 | 0.0047 |  |
| [CVE-2025-62408](https://patchblox.com/security/data/cve/CVE-2025-62408.md) | Routine | c-ares has a Use After Free vulnerability when connection is cleaned up after error | 5.9 | 0.0046 |  |

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Data as of 2026-11-11T01:43:54Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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