CVE detail
CVE-2026-12866
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.
Buzz score
Why this CVE is surfacing
This all-time snapshot uses the same composite formula as Trending across a 30-year evidence window, rather than a current rolling window.
Buzz score components · mention 16.1 · diversity 6.5 · KEV 0.0 · OTX 0.0 · PoC 0.0
Why it matters now
Mention timeline
- Total mentions
- 0
- within the 30d window
- Peak daily
- 0
- highest bucket
Evidence
Source links by recency
4 source links · newest first
- https://security.snyk.io/vuln/SNYK-JS-EXPREVAL-15054690security.snyk.io
No excerpt available.
Exploitsecurity.snyk.ioJun 23, 2026, 5:17 AM - https://security.snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-17662018security.snyk.io
No excerpt available.
Exploitsecurity.snyk.ioJun 23, 2026, 5:17 AM No excerpt available.
Exploitgithub.comJun 23, 2026, 5:17 AMNo excerpt available.
Exploitgithub.comJun 23, 2026, 5:17 AM
Exploit code
Public exploit repository references
Public PoC repositories are third-party, potentially unsafe artifacts. Treat their code as untrusted and use it only on authorized systems in an isolated, least-privilege environment. cvebuzz does not execute the code or verify that an exploit works.
0 repository references · best confidence N/A · max 0 stars
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