CVE-2026-12866All versions of the package expr-eval are vulnerable to Code Execution via the toJSFunction() API.
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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.
- CVSS
- 9.8 CRITICAL (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-94
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Deferred
- Record last updated
- Jul 7, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
No affected products are listed yet.
References
- https://github.com/silentmatt/expr-eval/blob/master/src/expression.js%23L55
- https://github.com/silentmatt/expr-eval/issues/292
- https://security.snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-17662018
- https://security.snyk.io/vuln/SNYK-JS-EXPREVAL-15054690
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.