What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-28 · updated 2026-08-28
• Weakness: CWE-74

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.

Affected products

• RooCodeInc Roo-Code: 3.51.0, 3.51.1

References

• https://gist.github.com/tchen200311/05b5960272c290b7843d6bbdbfe9f7c1
• https://vuldb.com/cve/CVE-2026-81835
• https://vuldb.com/submit/864286
• https://vuldb.com/vuln/396168
• https://vuldb.com/vuln/396168/cti

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