CVE-2026-40242 Vulnerability Analysis & Exploit Details

CVE-2026-40242
Vulnerability Scoring

7.2
/10
Very High Risk

Highly exploitable, CVE-2026-40242 poses a critical security risk that could lead to severe breaches.

Attack Complexity Details

  • Attack Complexity: Low
    Exploits can be performed without significant complexity or special conditions.
  • Attack Vector: Network
    Vulnerability is exploitable over a network without physical access.
  • Privileges Required: None
    No privileges are required for exploitation.
  • Scope: Changed
    Successful exploitation can impact components beyond the vulnerable component.
  • User Interaction: None
    No user interaction is necessary for exploitation.

CVE-2026-40242 Details

Status: Analyzed

Last updated: 🕖 21 Apr 2026, 19:01 UTC
Originally published on: 🕘 10 Apr 2026, 21:16 UTC

Time between publication and last update: 10 days

CVSS Release: version 3

CVSS3 Source

security-advisories@github.com

CVSS3 Type

Secondary

CVSS3 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

CVE-2026-40242 Vulnerability Summary

CVE-2026-40242: 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.

Assessing the Risk of CVE-2026-40242

Access Complexity Graph

The exploitability of CVE-2026-40242 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2026-40242

With low attack complexity and no required privileges, CVE-2026-40242 is an easy target for cybercriminals. Organizations should prioritize immediate mitigation measures to prevent unauthorized access and data breaches.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2026-40242, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2026-40242, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: Low
    CVE-2026-40242 could lead to minor leaks of non-critical information without major privacy breaches.
  • Integrity: Low
    Exploiting CVE-2026-40242 may cause minor changes to data without severely impacting its accuracy.
  • Availability: None
    CVE-2026-40242 does not impact system availability.

CVE-2026-40242 References

External References

CWE Common Weakness Enumeration

CWE-918

CAPEC Common Attack Pattern Enumeration and Classification

  • Server Side Request Forgery CAPEC-664 An adversary exploits improper input validation by submitting maliciously crafted input to a target application running on a server, with the goal of forcing the server to make a request either to itself, to web services running in the server’s internal network, or to external third parties. If successful, the adversary’s request will be made with the server’s privilege level, bypassing its authentication controls. This ultimately allows the adversary to access sensitive data, execute commands on the server’s network, and make external requests with the stolen identity of the server. Server Side Request Forgery attacks differ from Cross Site Request Forgery attacks in that they target the server itself, whereas CSRF attacks exploit an insecure user authentication mechanism to perform unauthorized actions on the user's behalf.

Vulnerable Configurations

  • cpe:2.3:a:getarcane:arcane:0.1.0:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:0.1.0:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:0.1.1:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:0.1.1:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:0.2.0:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:0.2.0:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:0.3.0:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:0.3.0:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:0.4.0:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:0.4.0:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:0.4.1:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:0.4.1:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:0.5.0:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:0.5.0:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:0.6.0:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:0.6.0:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:0.7.0:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:0.7.0:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:0.7.1:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:0.7.1:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:0.8.0:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:0.8.0:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:0.9.0:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:0.9.0:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:0.9.1:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:0.9.1:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:0.9.2:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:0.9.2:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:0.10.0:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:0.10.0:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:0.11.0:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:0.11.0:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:0.11.1:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:0.11.1:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:0.12.0:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:0.12.0:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:0.13.0:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:0.13.0:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:0.13.1:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:0.13.1:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:0.14.0:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:0.14.0:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:0.15.0:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:0.15.0:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:0.15.1:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:0.15.1:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:1.0.0:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:1.0.0:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:1.0.1:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:1.0.1:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:1.0.2:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:1.0.2:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:1.1.0:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:1.1.0:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:1.2.0:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:1.2.0:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:1.2.1:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:1.2.1:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:1.2.2:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:1.2.2:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:1.3.0:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:1.3.0:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:1.4.0:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:1.4.0:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:1.5.0:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:1.5.0:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:1.5.1:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:1.5.1:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:1.5.2:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:1.5.2:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:1.6.0:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:1.6.0:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:1.7.0:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:1.7.0:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:1.7.1:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:1.7.1:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:1.7.2:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:1.7.2:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:1.8.0:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:1.8.0:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:1.8.1:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:1.8.1:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:1.9.0:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:1.9.0:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:1.10.0:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:1.10.0:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:1.10.1:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:1.10.1:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:1.11.0:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:1.11.0:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:1.11.1:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:1.11.1:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:1.11.2:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:1.11.2:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:1.11.3:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:1.11.3:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:1.12.0:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:1.12.0:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:1.12.1:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:1.12.1:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:1.12.2:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:1.12.2:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:1.13.0:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:1.13.0:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:1.13.1:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:1.13.1:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:1.13.2:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:1.13.2:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:1.14.0:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:1.14.0:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:1.14.1:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:1.14.1:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:1.15.0:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:1.15.0:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:1.15.1:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:1.15.1:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:1.15.2:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:1.15.2:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:1.15.3:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:1.15.3:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:1.16.0:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:1.16.0:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:1.16.1:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:1.16.1:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:1.16.2:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:1.16.2:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:1.16.3:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:1.16.3:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:1.16.4:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:1.16.4:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:1.17.0:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:1.17.0:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:1.17.1:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:1.17.1:*:*:*:*:*:*:*
  • cpe:2.3:a:getarcane:arcane:1.17.2:*:*:*:*:*:*:*
    cpe:2.3:a:getarcane:arcane:1.17.2:*:*:*:*:*:*:*

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