---
id: CVE-2026-45698
title: >-
  Netatalk is a Free and Open Source file server suite for Unix-like operating
  systems
summary: >-
  Netatalk is a Free and Open Source file server suite for Unix-like operating
  systems. In versions 3.1.19 through 4.4.2, a stack-based buffer overflow
  exists in the deletedir() function of Netatalk's afpd daemon due to an integer
  underflo…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-191
published: '2026-08-17'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T21:11:46.833'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-45698'
references:
  - url: 'https://github.com/Netatalk/netatalk/releases/tag/netatalk-4-4-3'
    label: security-advisories@github.com
  - url: >-
      https://github.com/Netatalk/netatalk/security/advisories/GHSA-5443-v9xg-mqgv
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.00272
epssPercentile: 0.19784
ingestedAt: '2026-09-09T21:22:45.535Z'
---

## Overview

Netatalk is a Free and Open Source file server suite for Unix-like operating systems. In versions 3.1.19 through 4.4.2, a stack-based buffer overflow exists in the deletedir() function of Netatalk's afpd daemon due to an integer underflow in the calculation of the remaining buffer size used for path construction. deletedir() is a utility function called when a file operation crosses a device boundary inside an AFP shared volume, which the standard library's renameat() cannot handle. The function attempts to prevent buffer overflows by tracking available space in a size_t remain variable. However, the arithmetic used to compute remain results in an unsigned integer underflow, causing the variable to become SIZE_MAX. Because of this, the subsequent boundary check always evaluates as safe, allowing an unbounded strcpy() operation to copy attacker-controlled filenames into a nearly full stack buffer. Version 4.4.3 patches the issue.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.