CVE-2026-81835

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

MEDIUM
5.5
CVSS Score
Published: August 27, 2026 at 08:45 PM UTC
Updated: August 28, 2026 at 08:20 PM UTC
1 product affected across 1 vendorRoo-Code

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Severity
MEDIUM5.5
Exploit prediction
EPSS 0.3%
SSVC
PoC

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (5)

VDB EntryTechnical Description
Source: cverecord
https://vuldb.com/vuln/396168
SignaturePermissions Required
Source: cverecord
https://vuldb.com/vuln/396168/cti
Third Party Advisory
Source: cverecord
https://vuldb.com/cve/CVE-2026-81835
Third Party Advisory
Source: cverecord
https://vuldb.com/submit/864286

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.5MEDIUMVulDB
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-94CWE-74

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