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Vulnerabilities CVE-2026-12866

CVE-2026-12866

Critical
Open
TLP:CLEAR

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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.

Details

CVSS Score
9.2
EPSS Score
0.50%

40.1th percentile

CVSS 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
Confidence
90%
Published
Jun 23, 2026
Last Modified
Aug 12, 2026
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