Vulnerability · Published Apr 10, 2026 · Assigned by GitHub_M
CVE-2026-40242Arcane Unauthenticated SSRF with Conditional Response Reflection in Template Fetch Endpoint
High 7.2
In plain English
A high-severity server-side request forgery in arcane from getarcaneapp. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 50% of all known vulnerabilities). Ready-made attack tooling exists: Nuclei. Fixed versions are available - upgrade the affected package.
Official description
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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/getarcaneapp/arcane/backend | 1.17.3 | GHSA-ff24-4prj-gpmj |
| Go | github.com/getarcaneapp/arcane/backend | 1.17.3 | GO-2026-5356 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| getarcaneapp | arcane | < 1.17.3 |
Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
References
- https://github.com/getarcaneapp/arcane/security/advisories/GHSA-ff24-4prj-gpmj x_refsource_CONFIRM
- https://github.com/getarcaneapp/arcane/releases/tag/v1.17.3 x_refsource_MISC