Netatalk Stack Buffer Overflow (CVE-2026-44048) Poses High Risk
The National Vulnerability Database has detailed CVE-2026-44048, a high-severity stack buffer overflow vulnerability affecting Netatalk versions 2.0.4 through 4.4.2. This critical flaw stems from a UCS-2 type confusion within the convert_charset() function, which can be triggered remotely. Attackers can exploit this to achieve arbitrary code execution or cause denial-of-service conditions.
The CVSSv3.1 score of 8.8 (High) underscores the severity, with a vector indicating network-based exploitation requiring low privileges and no user interaction, leading to high impacts on confidentiality, integrity, and availability. Organizations using Netatalk for file sharing, particularly those exposing it to untrusted networks, face significant risk.
Defenders must prioritize patching. The National Vulnerability Database confirms this issue is fixed in Netatalk version 4.4.3. Ignoring this vulnerability leaves a wide-open door for attackers to compromise file servers and potentially pivot deeper into the network. This isn’t a theoretical risk; it’s a direct path to a full system compromise.
What This Means For You
- If your organization uses Netatalk, identify all instances running versions 2.0.4 through 4.4.2 immediately. Patching to version 4.4.3 or later is non-negotiable. Audit your network for exposed Netatalk services and restrict access to trusted networks only. This vulnerability allows remote code execution, which means a full server takeover without user interaction.
Related ATT&CK Techniques
🛡️ Detection Rules
3 rules · 6 SIEM formats3 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
CVE-2026-44048 - Netatalk convert_charset() Stack Buffer Overflow
title: CVE-2026-44048 - Netatalk convert_charset() Stack Buffer Overflow
id: scw-2026-05-21-ai-1
status: experimental
level: critical
description: |
Detects the execution of the Netatalk process with a command line indicating the vulnerable convert_charset function, potentially exploited via CVE-2026-44048. This rule targets the initial access vector of the vulnerability.
author: SCW Feed Engine (AI-generated)
date: 2026-05-21
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-44048/
tags:
- attack.initial_access
- attack.t1190
logsource:
category: process_creation
detection:
selection:
Image|endswith:
- 'netatalk'
CommandLine|contains:
- 'convert_charset'
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-44048 | Buffer Overflow | Netatalk versions 2.0.4 through 4.4.2 |
| CVE-2026-44048 | Buffer Overflow | Stack buffer overflow in convert_charset() function |
| CVE-2026-44048 | Buffer Overflow | Type confusion (ucs-2) in convert_charset() |
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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