EXECUTIVE SUMMARY:
CVE-2026-55441 with a CVSS score of 8.6 is a high-severity vulnerability affecting the rust/mise development tool in versions prior to 2026.6.4. This flaw stems from a bypass of the trust mechanism, where task-include files are loaded without a security check if no configuration file exists in the directory. An attacker can exploit this by enticing a victim to clone a malicious repository containing a specific task-include directory with a crafted task file containing Tera template syntax, such as `{{ exec(command='...') }}`. The attack is triggered automatically when the victim changes into the untrusted directory and runs simple read-only commands like `mise tasks` or even uses tab completion, requiring no explicit trust prompt acceptance. Consequently, the attacker gains the capability to execute arbitrary commands on the victim’s system with the user’s current privileges. Successful exploitation poses significant business risks, including potential remote code execution, data exfiltration, and full system compromise, undermining development environment integrity. Exploitation is contingent on the target using a vulnerable version of mise and interacting with a malicious repository structure that lacks a top-level configuration file.[/subscribe_to_unlock_form]
EXECUTIVE SUMMARY:
CVE-2026-55441 with a CVSS score of 8.6 is a high-severity vulnerability affecting the rust/mise development tool in versions prior to 2026.6.4. This flaw stems from a bypass of the trust mechanism, where task-include files are loaded without a security check if no configuration file exists in the directory. An attacker can exploit this by enticing a victim to clone a malicious repository containing a specific task-include directory with a crafted task file containing Tera template syntax, such as `{{ exec(command='...') }}`. The attack is triggered automatically when the victim changes into the untrusted directory and runs simple read-only commands like `mise tasks` or even uses tab completion, requiring no explicit trust prompt acceptance. Consequently, the attacker gains the capability to execute arbitrary commands on the victim’s system with the user’s current privileges. Successful exploitation poses significant business risks, including potential remote code execution, data exfiltration, and full system compromise, undermining development environment integrity. Exploitation is contingent on the target using a vulnerable version of mise and interacting with a malicious repository structure that lacks a top-level configuration file.[emaillocker id="1283"]
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The following reports contain further technical details:
https://github.com/advisories/GHSA-77g9-363w-rccq