RooCodeInc Roo-Code MCP Integration Trust Model malicious_mcp_server.py fetch_instructions code injection (CVE-2026-81835) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-81835

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

Answer in brief

CVE-2026-81835 records a Unknown severity vulnerability in RooCodeInc Roo-Code MCP Integration Trust Model malicious_mcp_server.py fetch_instructions code injection. The current sources do not mark it as known exploited. The current feed maps RooCodeInc/Roo-Code (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 27, 2026Updated Aug 27, 2026Source checked Aug 28, 2026First seen by HOL Aug 27, 2026Material review Aug 27, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps RooCodeInc/Roo-Code (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
RooCodeInc/Roo-Codegeneric	3.51.0 \|\| 3.51.1	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for RooCodeInc/Roo-Code.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Aug 27, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 27, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 27, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.