npm package expr-eval is vulnerable to Prototype Pollution. An attacker with access to express eval interface can use JavaScript prototype-based inheritance model to achieve arbitrary code execution. The npm expr-eval-fork package resolves this issue.
{
"github_reviewed": true,
"github_reviewed_at": "2025-11-17T18:39:19Z",
"nvd_published_at": "2025-11-14T17:16:01Z",
"severity": "HIGH",
"cwe_ids": [
"CWE-1321"
]
}