CVE-2026-81835

MEDIUM 5.5

RooCodeInc Roo-Code MCP Integration Trust Model malicious_mcp_server.py fetch_instructions code injection

CVSS Score

5.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-94 CWE-74
Vendor	roocodeinc
Product	roo-code
Published	Aug 27, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

Affected Versions

RooCodeInc / Roo-Code

3.51.0 3.51.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

🔍 tchen200311 (VulDB User) VulDB CNA Team