Cloudanix VulnDB

CVE-2026-54555

High · 7.8

CVSS

7.8

EPSS

0.2%

Published

Jun 23, 2026

CISA due date

—

The record

rtk filters and compresses command outputs before they reach your LLM context. Prior to 0.42.2, the permission splitter did not conservatively split or reject several shell constructs that Bash treats as command execution boundaries or nested execution. As a result, a command beginning with an allowed prefix such as git could hide a second command behind one of these constructs. rtk rewrite returned exit code 0, causing the Claude hook to emit permissionDecision: "allow". The rewritten command still contained the hidden command, so it ran without the user confirmation or denial that the permission rules were intended to enforce. This vulnerability is fixed in 0.42.2.

Affected packages

Ecosystem Package Introduced Fixed

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