Moby is an open source container framework. Prior to version 29.3.1, a security vulnerability has been detected that allows attackers to bypass authorization plugins (AuthZ). This issue has been patched in version 29.3.1.

An update of the docker package has been released.

The version of docker installed on the remote host is prior to 25.0.14-1. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2ECS-2026-106 advisory.

    url.Parse insufficiently validated the host/authority component and accepted some invalid URLs.
    (CVE-2026-25679)

    On Unix platforms, when listing the contents of a directory using File.ReadDir or File.Readdir the     returned FileInfo could reference a file outside of the Root in which the File was opened. The impact of     this escape is limited to reading metadata provided by lstat from arbitrary locations on the filesystem     without permitting reading or writing files outside the root. (CVE-2026-27139)

    Actions which insert URLs into the content attribute of HTML meta tags are not escaped. This can allow XSS     if the meta tag also has an http-equiv attribute with the value refresh. A new GODEBUG setting has been     added, htmlmetacontenturlescape, which can be used to disable escaping URLs in actions in the meta content     attribute which follow url= by setting htmlmetacontenturlescape=0. (CVE-2026-27142)

    gRPC-Go is the Go language implementation of gRPC. Versions prior to 1.79.3 have an authorization bypass     resulting from improper input validation of the HTTP/2 `:path` pseudo-header. The gRPC-Go server was too     lenient in its routing logic, accepting requests where the `:path` omitted the mandatory leading slash     (e.g., `Service/Method` instead of `/Service/Method`). While the server successfully routed these requests     to the correct handler, authorization interceptors (including the official `grpc/authz` package) evaluated     the raw, non-canonical path string. Consequently, deny rules defined using canonical paths (starting     with `/`) failed to match the incoming request, allowing it to bypass the policy if a fallback allow     rule was present. This affects gRPC-Go servers that use path-based authorization interceptors, such as the     official RBAC implementation in `google.golang.org/grpc/authz` or custom interceptors relying on     `info.FullMethod` or `grpc.Method(ctx)`; AND that have a security policy contains specific deny rules     for canonical paths but allows other requests by default (a fallback allow rule). The vulnerability is     exploitable by an attacker who can send raw HTTP/2 frames with malformed `:path` headers directly to the     gRPC server. The fix in version 1.79.3 ensures that any request with a `:path` that does not start with a     leading slash is immediately rejected with a `codes.Unimplemented` error, preventing it from reaching     authorization interceptors or handlers with a non-canonical path string. While upgrading is the most     secure and recommended path, users can mitigate the vulnerability using one of the following methods: Use     a validating interceptor (recommended mitigation); infrastructure-level normalization; and/or policy     hardening. (CVE-2026-33186)

    Moby is an open source container framework. Prior to version 29.3.1, a security vulnerability has been     detected that allows plugins privilege validation to be bypassed during docker plugin install. Due to an     error in the daemon's privilege comparison logic, the daemon may incorrectly accept a privilege set that     differs from the one approved by the user. Plugins that request exactly one privilege are also affected,     because no comparison is performed at all. This issue has been patched in version 29.3.1. (CVE-2026-33997)

    Moby is an open source container framework. Prior to version 29.3.1, a security vulnerability has been     detected that allows attackers to bypass authorization plugins (AuthZ). This issue has been patched in     version 29.3.1. (CVE-2026-34040)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of the Docker Engine installed on the remote host is prior to 29.3.1. It is therefore affected by multiple vulnerabilities:

  - CVE-2026-34040: AuthZ plugin authorization bypass vulnerability. Authorization plugins could be bypassed     under specific conditions, potentially allowing unauthorized access.

  - CVE-2026-33997: Plugin privilege validation bypass vulnerability in 'docker plugin install' command.
    A flaw in privilege validation could be partially bypassed, potentially leading to unauthorized privilege     escalation.

  - CVE-2026-33748: BuildKit Git URL validation vulnerability. Insufficient validation of Git URL '#ref:subdir'     fragments could allow access to files outside the intended repository scope, leading to unauthorized     information disclosure.

  - CVE-2026-33747: BuildKit arbitrary file write vulnerability. An untrusted frontend could cause files to be     written outside the BuildKit state directory, potentially allowing local privilege escalation or unauthorized     file writes.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Moby is an open source container framework. Prior to version 29.3.1, a security vulnerability has been     detected that allows attackers to bypass authorization plugins (AuthZ). This issue has been patched in     version 29.3.1. (CVE-2026-34040)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
306350	Photon OS 5.0: Docker PHSA-2026-5.0-0809	Nessus	PhotonOS Local Security Checks	medium
306277	Amazon Linux 2 : docker, --advisory ALAS2ECS-2026-106 (ALASECS-2026-106)	Nessus	Amazon Linux Local Security Checks	high
304803	Docker Engine 29.3.1 Multiple Vulnerabilities	Nessus	Misc.	high
304756	Linux Distros Unpatched Vulnerability : CVE-2026-34040	Nessus	Misc.	high

Detections

Analytics

CVE-2026-34040

high

Tenable Plugins

medium

high

high

high