Security Advisory

CVE-2026-12866

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-06-23 05:00:00

Last updated 2026-07-07 18:18:02

Assigner snyk

CVSS score 9.8

State PUBLISHED

Description

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.

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