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CVE-2026-81835— RooCodeInc Roo-Code MCP Integration Trust Model malicious_mcp_server.py fetch_instructions code injection

Quick assessment

Affected
RooCodeInc Roo-Code
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Roomote Roo Code是Roomote公司的一款人工智能编程辅助软件。 roocodeinc roo-code 3.51.1及之前版本存在安全漏洞，该漏洞源于MCP Integration Trust Model组件中malicious_mcp_server.py文件的fetch_instructions函数处理不当，可能导致远程代码注入。

CVSS 5.5 · Medium EPSS 0.30% · P21

Possible ATT&CK Techniques 1 AI

T1059.001 · PowerShell

Affected Version Matrix 2

VendorProduct Version RangeStatus
RooCodeInc Roo-Code 3.51.0 affected
3.51.1 affected
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I. Basic Information for CVE-2026-81835

Vulnerability Information
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Vulnerability Title
RooCodeInc Roo-Code MCP Integration Trust Model malicious_mcp_server.py fetch_instructions code injection
Source: CVE Program / CVE List V5
Vulnerability Description
A security vulnerability has been detected in RooCodeInc Roo-Code up to 3.51.1. This affects the function fetch_instructions of the file malicious_mcp_server.py of the component MCP Integration Trust Model. The manipulation leads to code injection. The attack is possible to be carried out remotely. The exploit has been disclosed publicly and may be used. Multiple isses were reported to the vendor beforehand. They explain, that "they all apply to Roo Code, a project we no longer support - the repository was archived a while ago, and we don't encourage anyone to use it." This vulnerability only affects products that are no longer supported by the maintainer.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5
Vulnerability Title
roocodeinc roo-code 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Roomote Roo Code是Roomote公司的一款人工智能编程辅助软件。 roocodeinc roo-code 3.51.1及之前版本存在安全漏洞，该漏洞源于MCP Integration Trust Model组件中malicious_mcp_server.py文件的fetch_instructions函数处理不当，可能导致远程代码注入。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
RooCodeInc Roo-Code 3.51.0 cpe:2.3:a:roocodeinc:roo-code:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-81835

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III. Intelligence Information for CVE-2026-81835

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Vendor Advisories for CVE-2026-81835 (3)

News Coverage for CVE-2026-81835 (1)

Same Patch Batch · RooCodeInc · 2026-08-27 · 5 CVEs total

CVE-2026-81834 6.3 MEDIUM RooCodeInc Roo-Code README File ExecaTerminalProcess code injection
CVE-2026-81837 6.3 MEDIUM RooCodeInc Roo-Code ApplyPatchTool ApplyPatchTool.ts path.resolve path traversal
CVE-2026-81833 5.5 MEDIUM RooCodeInc Roo-Code CodeIndexManager helpers.ts optimizeQuery code injection
CVE-2026-81836 3.7 LOW RooCodeInc Roo-Code OAuth Callback oauth.ts cleartext transmission

IV. Related Vulnerabilities

Same product: Roo-Code
Same vendor: RooCodeInc
Same weakness: CWE-94

V. Comments for CVE-2026-81835

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