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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.

在 RooCodeInc 公司发布的 Roo-Code（版本 3.51.1 及更早版本）中发现了一个安全漏洞。该漏洞影响的是 MCP 集成信任模型 组件中 文件里的 函数。攻击者通过操纵该函数可导致代码注入，且攻击可远程执行。 该漏洞的利用方式已公开披露，可能正被利用。此前已向供应商报告了多个相关问题。供应商回应称：“这些问题均适用于 Roo Code——我们不再支持该项目。其代码仓库早在之前就已归档，我们不建议任何人继续使用它。” 该漏洞仅影响维护者已不再支持的产品。

CVSS 5.5 · Medium

Possible ATT&CK Techniques 1 AI

T1059.001 · PowerShell
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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

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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