Medium severity · published Aug 27, 2026
CVE-2026-81835
RooCodeInc Roo-Code MCP Integration Trust Model malicious_mcp_server.py fetch_instructions code injection
5.5
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 23% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RO
Roo-Code · RooCodeInc
3.51.0; 3.51.1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-81835
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-81835
gist.github.com
https://gist.github.com/tchen200311/05b5960272c290b7843d6bbdbfe9f7c1
vuldb.com
https://vuldb.com/cve/CVE-2026-81835
vuldb.com
https://vuldb.com/submit/864286
vuldb.com
https://vuldb.com/vuln/396168
vuldb.com
https://vuldb.com/vuln/396168/cti
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