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Vulnerability record · CVE-2025-69256 · published 30 December 2025

CVE-2025-69256: Serverless command injection vulnerability

Serverless · Serverless

The Serverless Framework is a framework for using AWS Lambda and other managed cloud services to build applications. Starting in version 4.29.0 and prior to version 4.29.3, a command injection vulnerability exists in the Serverless Framework's built-in MCP server package (@serverless/mcp). This vulnerability only affects users of the experimental MCP server feature (serverless mcp), which represents less than 0.1% of Serverless Framework users. The core Serverless Framework CLI and deployment functionality are not affected. The vulnerability is caused by the unsanitized use of input parameters within a call to `child_process.exec`, enabling an attacker to inject arbitrary system commands. Successful exploitation can lead to remote code execution under the server process's privileges. The server constructs and executes shell commands using unvalidated user input directly within command-line strings. This introduces the possibility of shell metacharacter injection (`|`, `>`, `&&`, etc.). Version 4.29.3 fixes the issue.

7.5 CVSS 3.1 High EPSS 2.4% · top 16.8% CWE-77 · Command injection
7.5CVSS 3.1 base score
2.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 1 tagged exploit
17 Jun 2026Last modified by NVD

Description

The Serverless Framework is a framework for using AWS Lambda and other managed cloud services to build applications. Starting in version 4.29.0 and prior to version 4.29.3, a command injection vulnerability exists in the Serverless Framework's built-in MCP server package (@serverless/mcp). This vulnerability only affects users of the experimental MCP server feature (serverless mcp), which represents less than 0.1% of Serverless Framework users. The core Serverless Framework CLI and deployment functionality are not affected. The vulnerability is caused by the unsanitized use of input parameters within a call to `child_process.exec`, enabling an attacker to inject arbitrary system commands. Successful exploitation can lead to remote code execution under the server process's privileges. The server constructs and executes shell commands using unvalidated user input directly within command-line strings. This introduces the possibility of shell metacharacter injection (`|`, `>`, `&&`, etc.). Version 4.29.3 fixes the issue.

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/serverless/serverless/blob/6213453da7df375aaf12fb3522ab8870488fc59a/packages/mcp/src/tools/list-proje Product
https://github.com/serverless/serverless/commit/681ca039550c7169369f98780c6301a00f2dc4c4 Patch
https://github.com/serverless/serverless/releases/tag/sf-core%404.29.3 Release Notes
https://github.com/serverless/serverless/security/advisories/GHSA-rwc2-f344-q6w6 ExploitMitigationVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2025-69256), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.