by Kastro
Paper/Archive/CVE-2026-55494

CVE-2026-55494

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

EPSS 0.6%public exploitCVSS 9.8
critical.is priorityof 100
50
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 50.6.506 × 2010.1Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
tugtainer< 1.30.4–CNA

Scores by source

GitHub_M (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: poc · Automatable: yes · Technical impact: total

References

exploitgithub.com/Quenary/tugtainer/security/advisories/GHSA-wgw2-c96g-p7h7refgithub.com/Quenary/tugtainer/commit/0052a5544e187a4d12f771838a8a23ca4afb61cdrefgithub.com/Quenary/tugtainer/releases/tag/v1.30.4