CVE-2026-40242
Arcane Unauthenticated SSRF with Conditional Response Reflection in Template Fetch Endpoint
MEDIUM 6.5EPSS 0.7%
Arcane is an interface for managing Docker containers, images, networks, and volumes. Prior to 1.17.3, the /api/templates/fetch endpoint accepts a caller-supplied url parameter and performs a server-side HTTP GET request to that URL without authentication and without URL scheme or host validation. The server's response is returned directly to the caller. type. This constitutes an unauthenticated SSRF vulnerability affecting any publicly reachable Arcane instance. This vulnerability is fixed in 1.17.3.
- Affected
- getarcaneapp · arcane
- CVSS v3.1 NVD
- 6.5 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N - CVSS v3.1 GITHUB
- 7.2 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N - EPSS
- 0.72% chance of exploitation in the next 30 days, 53rd percentile
- Nuclei
- high · CWE-918
- Published
- 2026-04-10
- Updated
- 2026-04-13
Nuclei templates (1)
Security advisories
- getarcaneapp/arcane/security/advisories/GHSA-ff24-4prj-gpmj
- advisories/GHSA-ff24-4prj-gpmj
- getarcaneapp/arcane/releases/tag/v1.17.3