CVE-2026-63108 Roo Code 3.54.0 Command Injection via Parameter Expansion Parsing
Attackers can execute arbitrary commands by bypassing allowlist checks in Roo Code's auto-approve feature via nested parameter expansions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-63108?
CVE-2026-63108 is a high-severity command injection vulnerability in RooCodeInc Roo-Code, published on 20 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Roo Code through 3.54.0 contains a command injection vulnerability in the auto-approve execute feature 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 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.
Weakness: CWE-184
Which versions are affected by CVE-2026-63108?
How do I fix CVE-2026-63108?
No fix has been published for CVE-2026-63108 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-63108 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-63108 exists.
Sources
Also known as GHSA-5xxh-cfjg-qm65.