Vulnerability in Quenary Tugtainer
CVE-2026-55494
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Quenary Tugtainer — versions < 1.30.4
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-55494?
- CVE-2026-55494 is a critical-severity vulnerability in Quenary Tugtainer, classified under Improper Access Control. CVSS score: 9.8/10. Published 2026-09-30.
- How severe is CVE-2026-55494?
- Critical severity. CVSS v3 base score is 9.8 out of 10.