CVE-2026-44052: Netatalk Information Disclosure Bug

CVE-2026-44052 Overview

CVE-2026-44052 is an information disclosure vulnerability in Netatalk, the open-source implementation of the Apple Filing Protocol (AFP) for Unix-like operating systems. Netatalk versions 2.1.0 through 4.4.2 write Lightweight Directory Access Protocol (LDAP) simple-bind passwords into log output in cleartext. An attacker with read access to the affected log files can recover the LDAP bind credentials used by the Netatalk service. The weakness is classified as [CWE-532] Insertion of Sensitive Information into Log File.

Critical Impact

Disclosure of LDAP bind credentials enables attackers to authenticate against the directory service and pivot to broader identity and file-share resources.

Affected Products

• Netatalk 2.1.0 through 2.x releases
• Netatalk 3.x releases up to 4.4.2
• Netatalk 4.0.0 through 4.4.2

Discovery Timeline

• 2026-05-21 - CVE-2026-44052 published to NVD
• 2026-05-21 - Last updated in NVD database

Technical Details for CVE-2026-44052

Vulnerability Analysis

Netatalk supports authenticating users against an LDAP directory through the uams_pam.so and related User Authentication Modules (UAMs). During LDAP simple-bind operations, the daemon constructs diagnostic messages that include the bind Distinguished Name (DN) and the associated password. These messages are emitted to the standard Netatalk log targets configured in afp.conf, typically afpd.log or syslog.

The logging code path does not redact, mask, or omit the password parameter before passing it to the log formatter. As a result, any successful or failed LDAP bind attempt produces a record containing the plaintext credential. Operators reviewing logs, log-shipping pipelines, and any user with file system read access to the log directory can retrieve the password.

The vulnerability requires no authentication or user interaction to be introduced into the logs, because LDAP bind events are generated by normal Netatalk operation when clients authenticate. Exploitation requires read access to the log artifact, which is commonly granted to administrators, monitoring agents, and backup processes.

Root Cause

The root cause is improper handling of sensitive authentication material in diagnostic output. The LDAP integration treats the simple-bind password as a routine string parameter rather than a secret, violating the principle of minimal exposure for credentials.

Attack Vector

An attacker who reads afpd.log, syslog archives, centralized log indexes, or backup copies of these files extracts the cleartext LDAP password. The recovered credential can then be used to query or modify directory contents, enumerate users, or authenticate to other services bound to the same directory.

No exploitation code is required. The vulnerability is described in the Netatalk CVE-2026-44052 Advisory.

Detection Methods for CVE-2026-44052

Indicators of Compromise

• Presence of plaintext password strings adjacent to LDAP bind DNs in afpd.log or syslog entries originating from Netatalk processes.
• Unexpected LDAP authentication events from hosts running Netatalk after log files were accessed by non-administrative accounts.
• Access to Netatalk log files by users, services, or processes that do not have an operational need to read them.

Detection Strategies

• Grep historical log archives for the LDAP bind DN used by Netatalk and inspect adjacent fields for password values.
• Audit file system access events on /var/log/ and any centralized log store for reads against Netatalk log paths.
• Correlate LDAP authentication telemetry with the source IP of the Netatalk host to identify reuse of the leaked credential from new locations.

Monitoring Recommendations

• Forward Netatalk logs into a SIEM and apply a rule that alerts when patterns matching password= or known bind DN strings appear in log content.
• Monitor directory service authentication logs for the Netatalk service account and alert on logons from unexpected hosts.
• Track integrity and access control changes on the Netatalk log directory using file integrity monitoring.

How to Mitigate CVE-2026-44052

Immediate Actions Required

• Rotate the LDAP bind password used by Netatalk on every host running an affected version.
• Restrict read permissions on afpd.log, syslog files, and any backup or log-shipping destinations that retained historical entries.
• Purge or sanitize archived log records that contain the exposed credential.

Patch Information

Apply the fix described in the Netatalk CVE-2026-44052 Advisory. Upgrade to a Netatalk release later than 4.4.2 that removes the LDAP password from log output. Distribution-provided backports should be applied where available.

Workarounds

• Raise the Netatalk log level so that LDAP bind diagnostics are suppressed, where supported by the deployed version.
• Set restrictive file modes (for example 0600) and an exclusive owner on Netatalk log files and their parent directory.
• Exclude Netatalk log files from broad log-collection pipelines until the patched version is deployed and historical logs are sanitized.

# Restrict access to Netatalk logs and rotate the bind password
sudo chown root:root /var/log/afpd.log
sudo chmod 600 /var/log/afpd.log
sudo ldappasswd -x -D "cn=admin,dc=example,dc=com" -W "uid=netatalk,ou=services,dc=example,dc=com"