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CVE-2026-55786

8.4 · HIGH

Flyto2 Core is an execution kernel for automation and AI-agent workflows.

Published Oct 14, 2026CWE-78EPSS 0.41%

Overview

CVE-2026-55786 is a high-severity vulnerability. It was published on October 14, 2026 and has a CVSS 3.1 base score of 8.4 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.4, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

Flyto2 Core is an execution kernel for automation and AI-agent workflows. From 2.26.2 until 2.26.4, the HTTP MCP POST /mcp route accepts unauthenticated JSON-RPC tools/call requests and forwards execute_module arguments to the module registry without the require_auth dependency used by the REST execution routes. An unauthenticated caller can select sandbox.execute_shell and supply its command parameter, which reaches asyncio.create_subprocess_shell with the privileges of the flyto-core server process. The endpoint is reachable locally under the default loopback binding and becomes network reachable when an operator binds the server to a non-loopback interface, allowing arbitrary OS command execution and potential full host compromise. This issue is fixed in version 2.26.4.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/flytohub/flyto-core/commit/db7f116b1d3c5dcf94aded00d14118f81f3e225eGitHubgithub.com/flytohub/flyto-core/releases/tag/v2.26.4GitHubgithub.com/flytohub/flyto-core/security/advisories/GHSA-h9f9-h6gm-wc85GitHubgithub.com/flytohub/flyto-core/security/advisories/GHSA-h9f9-h6gm-wc85

How CyberStrike helps

Frequently asked questions

What is CVE-2026-55786?

CVE-2026-55786 is a high-severity vulnerability. It was published on October 14, 2026 and has a CVSS 3.1 base score of 8.4 (HIGH).

How severe is CVE-2026-55786?

This vulnerability has a CVSS 3.1 base score of 8.4, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-55786?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-55786?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-55786 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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