CVE-2026-12866

Published: Jun 23, 2026Modified: Jul 7, 2026Deferred

9.2

Vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:XShow less

Source: report@snyk.io (Secondary)

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.

Related CWEs

CWE-94

Improper Control of Generation of Code ('Code Injection')

The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.

References (5)

https://github.com/silentmatt/expr-eval/blob/master/src/expression.js%23L55

Source: report@snyk.io

https://github.com/silentmatt/expr-eval/issues/292

Source: report@snyk.io

https://security.snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-17662018

Source: report@snyk.io

https://security.snyk.io/vuln/SNYK-JS-EXPREVAL-15054690

Source: report@snyk.io

https://security.snyk.io/vuln/SNYK-JS-EXPREVAL-15054690

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

Timeline

No history available yet.