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CVE-2025-13204

CVE-2025-13204

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.

CVSS 3.1 · 9.8 Critical EPSS < 1% KEV · Not listed
Vendors
Expr-eval Project Silentmatt
Products
Expr-eval Javascript Expression Evaluator
CVE-2026-12866

expr-eval: expr-eval: Code Execution via crafted expressions in toJSFunction() API

All versions of the package expr-eval are vulnerable to Code Execution via the toJSFunction() API. An attacker can execute arbitrary JavaScript by supplying crafted expressions that are compiled into native code using new Function(). Because user-controlled expressions are transformed directly into executable JavaScript, attackers can escape the intended expression sandbox and run arbitrary code within the application's context.

CVSS 4.0 · 9.2 Critical EPSS < 1% KEV · Not listed
Vendors
Silentmatt
Products
Expr-eval
CVE-2025-12735

CVE-2025-12735

The expr-eval library is a JavaScript expression parser and evaluator designed to safely evaluate mathematical expressions with user-defined variables. However, due to insufficient input validation, an attacker can pass a crafted context object or use MEMBER of the context object into the evaluate() function and trigger arbitrary code execution.

CVSS 3.1 · 9.8 Critical EPSS 1.8% KEV · Not listed
Vendors
Expr-eval Project Jorenbroekema Silentmatt
Products
Expr-eval Javascript Expression Evaluator Javascript Expression Evaluator