# CVE-2025-59529: simple protocol server ignores accepts unlimited connections and logs failures without limit

CVE-2025-59529 is fixed in 3 products on 1 platform, first by OPENSUSE-SU-2026:21417-1, released July 22, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2025-59529
- Priority: Routine
- CVSS: 5.5 (Moderate)
- EPSS: 0.0022
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Dec 21, 2025
- Weakness: Uncontrolled Resource Consumption
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-59529

## Description

This update for avahi fixes the following issue:  - CVE-2025-59529: local DoS due to simple protocol server ignoring client limit CLIENTS_MAX (bsc#1255451).

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | avahi opensuse-leap 16.0 | 0.8-160000.6.1 | [OPENSUSE-SU-2026:21417-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21417-1.md) | Jul 22, 2026 |
| Linux | avahi sles 15.7 | 0.8-150600.15.21.1 | [SUSE-SU-2026:3218-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3218-1.md) | Jul 23, 2026 |
| Linux | avahi sles 16.0 | 0.8-160000.6.1 | [SUSE-SU-2026:22853-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22853-1.md) | Jul 22, 2026 |
| Linux | avahi-glib2 opensuse-leap 16.0 | 0.8-160000.6.1 | [OPENSUSE-SU-2026:21417-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21417-1.md) | Jul 22, 2026 |
| Linux | avahi-glib2 sles 15.7 | 0.8-150600.15.21.1 | [SUSE-SU-2026:3218-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3218-1.md) | Jul 23, 2026 |
| Linux | avahi-glib2 sles 16.0 | 0.8-160000.6.1 | [SUSE-SU-2026:22853-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22853-1.md) | Jul 22, 2026 |
| Linux | avahi-qt6 opensuse-leap 16.0 | 0.8-160000.6.1 | [OPENSUSE-SU-2026:21417-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21417-1.md) | Jul 22, 2026 |

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Data as of 2026-11-10T13:56:55Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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