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.

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.

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.

Affected products

Roocodeinc Roo-code — versions 3.51.0, 3.51.1

Weakness classification (CWE)

References

cna@vuldb.com (technical-description, vdb-entry)
cna@vuldb.com (signature, permissions-required)
cna@vuldb.com (third-party-advisory)
cna@vuldb.com (third-party-advisory)
cna@vuldb.com (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.