CVE-2026-63108 RooCodeInc CVE debrief

Who should care

Defenders and security teams responsible for Roo Code installations should assess exposure and prioritize verification and remediation efforts. This includes reviewing and restricting usage of the auto-approve execute feature, implementing additional security measures to detect and prevent command injection attacks, and verifying and updating Roo Code installations to prevent potential command injection attacks. Security teams should also review compens

Why it matters

CVE-2026-63108 is a high-severity command injection vulnerability in Roo Code that allows attackers to bypass security controls and potentially execute arbitrary commands. Defenders should prioritize verifying and updating Roo Code installations to prevent potential command injection attacks.

• Potential for arbitrary command execution
• Bypassing of allowlist/denylist enforcement
• Possible exploitation via nested command substitutions

Technical summary

The command parser in parse-command.ts replaces parameter expansions with opaque placeholders before extracting command substitutions, causing the containsDangerousSubstitution guard to miss nested payloads, which are then auto-approved based on the outer allowlisted command prefix and executed by the shell via execa, enabling arbitrary command execution. This vulnerability is caused by the improper handling of command substitutions and parameter expansions in the auto-approve execute feature of Roo Code. The vulnerability can be exploited by attackers to execute arbitrary commands on affected systems, which could lead to a compromise of the system's security and integrity.

Defensive priority

Defenders should prioritize verifying and updating Roo Code installations to prevent potential command injection attacks.

Recommended defensive actions

• Verify Roo Code installations and update to a fixed version if available
• Review and restrict usage of the auto-approve execute feature
• Implement additional security measures to detect and prevent command injection attacks
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but additional information on affected versions and remediation is limited. The auto-approve execute feature in Roo Code through 3.54.0 contains a command injection vulnerability that allows attackers to bypass allowlist/denylist enforcement by nesting command substitutions inside parameter expansion defaults. The command parser in parse-command.ts replaces parameter expansions with opaque placeholders before extracting command substitutions, causing the containsDanger

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.