---
id: CVE-2026-55494
title: Tugtainer is a self-hosted app for automating updates of Docker containers
summary: >-
  Tugtainer is a self-hosted app for automating updates of Docker containers.
  Prior to version 1.30.4, Tugtainer Agent allows unauthenticated access to
  Docker management APIs when AGENT_SECRET is not configured. The Agent uses
  request sign…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-284
vendor: Quenary
product: tugtainer
affected:
  - tugtainer < 1.30.4
published: '2026-09-30'
updated: '2026-09-30'
sourceUpdated: '2026-09-30T19:57:08.043'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-55494'
references:
  - url: >-
      https://github.com/Quenary/tugtainer/commit/0052a5544e187a4d12f771838a8a23ca4afb61cd
    label: security-advisories@github.com
  - url: 'https://github.com/Quenary/tugtainer/releases/tag/v1.30.4'
    label: security-advisories@github.com
  - url: >-
      https://github.com/Quenary/tugtainer/security/advisories/GHSA-wgw2-c96g-p7h7
    label: security-advisories@github.com
  - url: >-
      https://github.com/Quenary/tugtainer/security/advisories/GHSA-wgw2-c96g-p7h7
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - exploit-available
  - cve.org
exploits:
  github: 1
  githubRepos:
    - >-
      https://github.com/4qu4r1um/tugtainer-1.30.2-CVE-2026-55494-and-CVE-2026-62308-to-RCE
  checkedAt: '2026-09-30T20:23:53.994Z'
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-09-30T17:12:48.476039Z'
ingestedAt: '2026-09-30T17:13:20.832Z'
---

## Overview

Tugtainer is a self-hosted app for automating updates of Docker containers. Prior to version 1.30.4, Tugtainer Agent allows unauthenticated access to Docker management APIs when AGENT_SECRET is not configured. The Agent uses request signatures to protect its API routes. However, in agent/auth.py, the signature verification function returns successfully if Config.AGENT_SECRET is empty. This causes protected Agent APIs to become accessible without authentication. This issue has been patched in version 1.30.4.

## Remediation

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