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PatchSiren cyber security CVE debrief

CVE-2026-44058 Netatalk CVE debrief

CVE-2026-44058 is a high-severity authentication bypass in Netatalk 2.2.2 through 4.4.2. According to the published CVE description, a remote privileged user can authenticate as an arbitrary user through the admin auth user mechanism. The NVD record assigns CVSS 3.1: 7.2 (High) with network attack vector, low attack complexity, high privileges required, no user interaction, and high impact to confidentiality, integrity, and availability.

Vendor
Netatalk
Product
Unknown
CVSS
HIGH 7.2
CISA KEV
Not listed in stored evidence
Original CVE published
2026-05-21
Original CVE updated
2026-05-21
Advisory published
2026-05-21
Advisory updated
2026-05-21

Who should care

Administrators and security teams running Netatalk deployments, especially environments where the admin auth user mechanism is enabled or where privileged remote access is possible. Organizations should also care if Netatalk is used in shared infrastructure, file services, or other systems where authentication controls are relied on for access boundaries.

Technical summary

The vulnerability is an authentication bypass in Netatalk, not a brute-force or credential theft issue. The published description states that affected versions 2.2.2 through 4.4.2 may allow a remote privileged user to authenticate as an arbitrary user via the admin auth user mechanism. NVD maps the issue to CWE-287 (Improper Authentication) and records a CVSS vector of CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H. The NVD item is marked Received and cites the Netatalk security advisory as its reference.

Defensive priority

High — prioritize validation and remediation for any Netatalk instance that may allow privileged remote authentication paths.

Recommended defensive actions

  • Inventory all Netatalk deployments and identify whether versions 2.2.2 through 4.4.2 are in use.
  • Check whether the admin auth user mechanism is enabled or relied upon in any production environment.
  • Apply the vendor’s guidance from the Netatalk security advisory referenced by NVD.
  • Restrict and monitor privileged remote access paths to Netatalk systems until remediation is confirmed.
  • Review authentication and access logs for unusual successful logins or user-identity switching behavior.
  • If remediation is delayed, reduce exposure by limiting network access to trusted administrative hosts only.

Evidence notes

The CVE description explicitly states the affected Netatalk version range and the admin auth user authentication-bypass condition. NVD provides the CVSS 3.1 vector, CWE-287 mapping, and marks the record as Received. The NVD reference list points to the Netatalk security advisory at netatalk.io, which is the primary source link in the supplied corpus.

Official resources

Publicly disclosed in the CVE record on 2026-05-21T08:16:21.353Z and last modified on 2026-05-21T09:16:28.050Z. No KEV listing was provided in the supplied corpus.