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CVE-2026-55582

8.4 · HIGH

mcp-shell is an MCP server for running shell commands securely, auditably, and on demand.

Published Aug 25, 2026CWE-78EPSS 0.27%

Overview

CVE-2026-55582 is a high-severity vulnerability. It was published on August 25, 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

mcp-shell is an MCP server for running shell commands securely, auditably, and on demand. Prior to 0.6.0, the default security.yaml allows /usr/bin/git, while security.go omits ! from containsShellMetacharacters and containsDangerousShellConstructs and applies no per-executable argument policy. A caller of the shell_exec MCP tool can provide the command argument /usr/bin/git -c alias.pwn=!<arbitrary-command>, causing Git to create a shell alias and execute arbitrary OS commands as the mcp-shell process user. The default Docker image runs as mcpuser with Git installed and secure mode enabled, so the bypass is exploitable in the default deployment without additional authentication beyond MCP connectivity. This issue is fixed in version 0.6.0.

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/sonirico/mcp-shell/commit/f31377fce6ec31114e5a4398c0e5270552bce09fGitHubgithub.com/sonirico/mcp-shell/pull/16GitHubgithub.com/sonirico/mcp-shell/releases/tag/v0.6.0GitHubgithub.com/sonirico/mcp-shell/security/advisories/GHSA-74hp-mggr-hv58GitHubgithub.com/sonirico/mcp-shell/security/advisories/GHSA-74hp-mggr-hv58

How CyberStrike helps

Frequently asked questions

What is CVE-2026-55582?

CVE-2026-55582 is a high-severity vulnerability. It was published on August 25, 2026 and has a CVSS 3.1 base score of 8.4 (HIGH).

How severe is CVE-2026-55582?

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-2026-55582?

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-2026-55582?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-55582 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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