PT-2026-51474 · Undefined · Undefined

Published 2026-06-23 · Updated 2026-06-23 · CVE-2026-12866

Mitre

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

Fix

Code Injection

Weakness Enumeration

CWE-94

Related Identifiers

CVE-2026-12866

Affected Products

Undefined

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-12866 · Security Note
• https://github.com/silentmatt/expr-eval/issues/292 · Note
• https://github.com/silentmatt/expr-eval/blob/master/src/expression.js%23L55 · Note
• https://security.snyk.io/vuln/SNYK-JS-EXPREVAL-15054690 · Note