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expr-eval

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.

The vulnerability identified as CVE-2025-12735 affects the silentmatt expr-eval library, a JavaScript tool designed to safely parse and evaluate mathematical expressions with user-defined variables. The core issue lies in improper control over code generation (CWE-94), where the library fails to adequately validate input passed as the context object or its members to the evaluate() function. This flaw allows an attacker to inject malicious code that gets executed during expression evaluation, effectively enabling arbitrary code execution. The vulnerability is exploitable remotely (AV:N), requires no privileges (PR:N) or user interaction (UI:N), and impacts confidentiality, integrity, and availability to a high degree (C:H/I:H/A:H), resulting in a CVSS v3.1 score of 9.8. The affected versions are indicated as '0', which likely means all versions prior to a fix or the initial release version. No patches or known exploits are currently documented, but the severity and ease of exploitation make it a critical threat. The vulnerability also relates to CWE-1321, which involves improper handling of member expressions, further contributing to the injection risk. This vulnerability is particularly dangerous in environments where user input is evaluated dynamically, such as web applications, server-side JavaScript environments (Node.js), or embedded scripting contexts. Attackers exploiting this flaw can execute arbitrary commands, potentially leading to full system compromise, data theft, or service disruption.

Detailed information about CVE-2025-12735: CWE-94: Improper Control of Generation of Code (‘Code Injection’) in silentmatt expr-eval affecting silentmatt expr-e

CVE-2025-12735: CWE-94: Improper Control of Generation of Code (‘Code Injection’) in silentmatt expr-eval - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2025-12735: CWE-94: Improper Control of Generation of Code (‘Code Injection’) in silentmatt expr-eval

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