RCE in Roocodeinc Roo-Code
CVE-2026-81835
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.003 (20.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 20.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
- Roocodeinc Roo-Code — versions 3.51.0, 3.51.1
Weakness classification (CWE)
References
- vuldb.com/vuln/396168 (technical-description, vdb-entry)
- vuldb.com/vuln/396168/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-81835 (third-party-advisory)
- vuldb.com/submit/864286 (third-party-advisory)
- gist.github.com/tchen200311/05b5960272c290b7843d6bbdbfe9f7c1 (exploit)
Frequently asked questions
- What is CVE-2026-81835?
- CVE-2026-81835 is a medium-severity vulnerability in Roocodeinc Roo-Code, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 5.5/10. Published 2026-08-28.
- How severe is CVE-2026-81835?
- Medium severity. CVSS v3 base score is 5.5 out of 10.