expr-eval vulnerable to Code Execution
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.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | org.webjars.npm:expr-eval | <= 2.0.2 | no fix |
| npm package | expr-eval | <= 2.0.2 | no fix |
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-12866
- https://github.com/silentmatt/expr-eval/issues/292
- https://github.com/silentmatt/expr-eval
- https://github.com/silentmatt/expr-eval/blob/master/src/expression.js#L55
- https://security.snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-17662018
- https://security.snyk.io/vuln/SNYK-JS-EXPREVAL-15054690
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H- Weakness (CWE)
CWE-94- Platform
- Java / Kotlin (Maven), npm
- Package
org.webjars.npm:expr-eval, expr-eval- Disclosed
- 23.06.2026
- Updated
- 11.10.2026 13:20
Sources and licenses
OSV / GitHub Advisory Database - GHSA-q9v2-7m5w-4693 - CC BY 4.0
Vulnerability history: expr-eval
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 3
- First → latest
- 11.2025 06.2026
- Without a fix
- 3
- Exploited in attacks
- 0
Severity breakdown
- Critical 1
- High 2
Disclosures per year
- 2025: 2
- 2026: 1
-
expr-eval vulnerable to Code Execution this entry
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