Netatalk Bitwise OR Error Handling Vulnerability Leading to Service Disruption

A vulnerability exists in Netatalk versions 2.1.0 through 4.4.2, where the error handling for Access Control Lists (ACLs) incorrectly combines multiple error numbers using a bitwise OR operation. This mismanagement of error codes can lead to improper error handling when multiple issues arise simultaneously. As a result, a remote attacker might exploit this vulnerability to cause a minor disruption of service by triggering these incorrect error-handling pathways.

Impact

Exploitation of this vulnerability can cause a minor service disruption by interfering with normal error handling processes, potentially leading to incorrect application behavior.

Remediation

Users can apply the patch named 'CVE-2026-44074.patch' to a Netatalk 4.4.2 source tree to hotfix their local Netatalk deployment. Alternatively, upgrading to Netatalk version 4.5.0 or later, which includes the patch, is recommended. However, the Netatalk team advises against proactively applying the patch to existing deployments due to the low practical exploitability.