Vulnerability details

CVE-2026-55494

Quenary tugtainer

Tugtainer: Unauthenticated access to Tugtainer Agent Docker management APIs when AGENT_SECRET is unset

CVSS 3.1

9.8Critical

Official description

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.

CVSS scores

Score	Version	Source	Vector
9.8Critical	3.1	CVEProject cvelistV5 (CNA) (GitHub_M)	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

Affected products

Vendor	Product	Versions	Source
Quenary	tugtainer	< 1.30.4	CVEProject cvelistV5 (CNA)

References and advisories

https://github.com/Quenary/tugtainer/commit/0052a5544e187a4d12f771838a8a23ca4afb61cd x_refsource_MISC
https://github.com/Quenary/tugtainer/releases/tag/v1.30.4 x_refsource_MISC
https://github.com/Quenary/tugtainer/security/advisories/GHSA-wgw2-c96g-p7h7 x_refsource_CONFIRM

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Details

Published: 2026-09-30
Last updated: 2026-09-30
State: Published
Assigner (CNA): GitHub_M

Exploit prediction (EPSS)

0.64%

Probability of exploitation in 30 days

50.8%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: Yes
Exploitation: Proof of concept
Technical impact: Total

Weaknesses (CWE)

CWE-284
Improper Access Control