In JetBrains Kotlin before 2.4.20 code execution was possible via unsafe deserialization in the build cache metadata
{
"cwe_ids": [
"CWE-502"
],
"github_reviewed": true,
"github_reviewed_at": "2026-08-12T19:25:23Z",
"nvd_published_at": "2026-06-26T14:17:05Z",
"severity": "MODERATE"
}