CVE-2026-44060: Netatalk DoS Vulnerability Poses High Risk
The National Vulnerability Database has disclosed CVE-2026-44060, a high-severity integer underflow vulnerability affecting Netatalk versions 1.5.0 through 4.4.2. Rated with a CVSS score of 7.5, this flaw resides in the dsi_writeinit() function, enabling unauthenticated attackers to trigger a denial-of-service (DoS) condition remotely. This isn’t theoretical; a DoS on a critical file-sharing service can cripple operations.
Netatalk is an open-source implementation of the Apple Filing Protocol (AFP), commonly used to allow Unix-like systems to serve files to macOS clients. Organizations relying on older Netatalk deployments as part of their critical infrastructure are directly exposed. An attacker doesn’t need complex exploits here; simply causing the service to crash can have significant operational impact, especially for environments where macOS integration is key.
The fix is available in Netatalk version 4.4.3. This is a straightforward patch. Defenders need to prioritize this update immediately. Ignoring this means leaving a wide-open door for service disruption, a low-effort, high-impact attack vector.
What This Means For You
- If your organization uses Netatalk, you need to identify all instances running versions 1.5.0 through 4.4.2 immediately. Prioritize patching to version 4.4.3 to mitigate CVE-2026-44060. Failure to do so leaves your file-sharing services vulnerable to remote denial-of-service attacks, which can severely impact business continuity.
Related ATT&CK Techniques
🛡️ Detection Rules
1 rule · 6 SIEM formats1 detection rule auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
CVE-2026-44060: Netatalk dsi_writeinit Integer Underflow DoS
title: CVE-2026-44060: Netatalk dsi_writeinit Integer Underflow DoS
id: scw-2026-05-21-ai-1
status: experimental
level: high
description: |
This rule detects potential exploitation attempts against Netatalk versions 1.5.0 through 4.4.2. The vulnerability (CVE-2026-44060) is an integer underflow in the dsi_writeinit() function, leading to a denial of service. This detection looks for specific URI patterns often associated with Apple Filing Protocol (AFP) traffic and the function name within the query string, which could indicate an attempt to trigger the vulnerability.
author: SCW Feed Engine (AI-generated)
date: 2026-05-21
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-44060/
tags:
- attack.initial_access
- attack.t1190
logsource:
category: webserver
detection:
selection:
cs-uri|contains:
- '/.AppleDouble/'
cs-uri-query|contains:
- 'dsi_writeinit'
sc-status:
- 200
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-44060 | DoS | Netatalk versions 1.5.0 through 4.4.2 |
| CVE-2026-44060 | DoS | Vulnerable function: dsi_writeinit() |
| CVE-2026-44060 | DoS | Vulnerability type: integer underflow |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | May 21, 2026 at 11:16 UTC |
This content was AI-rewritten and enriched by Shimi's Cyber World based on the original source. All intellectual property rights remain with the original author.
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