CVE-2026-12866Critical· 9.8▾ Midnightexpr-eval vulnerable to Code Execution
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 53.9 · likelihood 0.2 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 22.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via GHSA
Last analysed / modified upstream
0.9%
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.
expr-eval <= 2.0.2org.webjars.npm:expr-eval <= 2.0.2Refer to the advisory for the patched release.
Connected by shared product, vendor, weakness, or advisory.
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