Using ktlint to download and execute custom rulesets can result in arbitrary code execution as the served jars can be compromised by a MITM. This attack is exploitable via Man in the Middle of the HTTP connection to the artifact servers. This vulnerability appears to have been fixed in 0.30.0 and later; after commit 5e547b287d6c260d328a2cb658dbe6b7a7ff2261.
{
"cwe_ids": [
"CWE-319"
],
"github_reviewed": true,
"github_reviewed_at": "2020-06-16T21:54:05Z",
"nvd_published_at": null,
"severity": "HIGH"
}