Netatalk Authentication Bypass (CVE-2026-44058) Allows Admin Access
The National Vulnerability Database (NVD) reports a critical authentication bypass vulnerability, CVE-2026-44058, affecting Netatalk versions 2.2.2 through 4.4.2. This flaw, categorized as CWE-287 (Improper Authentication), allows an attacker to bypass authentication via an administrative authentication user, effectively gaining unauthorized access with high privileges.
Rated with a CVSSv3.1 score of 7.2 (HIGH), this vulnerability presents a significant risk. An unauthenticated attacker on the network (AV:N) can exploit this with low attack complexity (AC:L) to achieve high impact on confidentiality, integrity, and availability (C:H, I:H, A:H) without user interaction (UI:N). The attacker only needs high privileges (PR:H) before the bypass, indicating a potential escalation of privilege or a bypass for a specific admin role.
Defenders must prioritize patching Netatalk instances immediately. The NVD states that this issue is fixed in Netatalk version 4.5.0. Any organization running vulnerable versions is exposed to unauthorized administrative access, which can lead to complete system compromise or data exfiltration. The attacker’s calculus here is straightforward: find an exposed Netatalk service, exploit the bypass, and own the system.
What This Means For You
- If your organization uses Netatalk, you need to verify its version immediately. Any instance running Netatalk 2.2.2 through 4.4.2 is vulnerable to CVE-2026-44058. Patch to version 4.5.0 or later without delay. Also, audit your Netatalk logs for any suspicious administrative access attempts or unauthorized file operations prior to patching.
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-2026-44058 Netatalk Authentication Bypass
title: CVE-2026-44058 Netatalk Authentication Bypass
id: scw-2026-05-21-ai-1
status: experimental
level: high
description: |
This rule detects potential exploitation of CVE-2026-44058 by identifying Netatalk processes attempting an administrative action via a POST request to a URI containing '/admin'. This bypasses normal authentication mechanisms, allowing unauthorized administrative access.
author: SCW Feed Engine (AI-generated)
date: 2026-05-21
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-44058/
tags:
- attack.initial_access
- attack.t1190
logsource:
category: authentication
detection:
selection:
Image|contains:
- 'netatalk'
cs-uri|contains:
- '/admin'
cs-method|exact:
- 'POST'
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-44058 | Auth Bypass | Netatalk versions 2.2.2 through 4.4.2 |
| CVE-2026-44058 | Auth Bypass | admin auth user |
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.
Believe this infringes your rights? Submit a takedown request.
Related coverage
CVE-2026-42396 — Insufficient Validation of Member Zone Data May Cause
CVE-2026-42396 — Insufficient Validation of Member Zone Data May Cause Catalog Zone Transfer to Fail
CVE-2026-42002 — Concurrency and locking defects in
CVE-2026-42002 — Concurrency and locking defects in GSS-TSIG
CVE-2026-42001: Autoprimary SOA Queries Vulnerability
CVE-2026-42001 — Insufficient Validation of Autoprimary SOA Queries