CVE-2025-13204
High
Description
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.
SeverityHigh
CVSS7.3
Exploit probability—
ProductSilentmatt Javascript Expression Evaluator
PublishedNov 14, 2025
First seenNov 14, 2025
Weakness typeCWE-1321Prototype pollution
How to fix
Update
- expr-eval-fork2.0.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| silentmatt javascript_expression_evaluator | No range specified | — |
| expr-evalnpm | v ≤ 2.0.2 | — |
| expr-eval-forknpm | v < 2.0.2 | 2.0.2 |
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