CVE•Published 2026-06-23•Modified 2026-07-07•1 article on news•6 live references•NVD data
CVE-2026-12866
Vulnerability data via NVD (ingested)
CVSS v3.1
9.8
CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS percentile
36
Exploit Prediction Scoring System · top 64% of all CVEs
Weaknesses (CWE)
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.
Timeline
Published 2026-06-23
Modified 2026-07-07
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
More intel sources (5)
Shodan report
vuln:CVE-2026-12866Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-12866Censys host search filtered to this CVE id.
grep.app
CVE-2026-12866Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-12866GitHub code search for direct mentions.
Google dork
"CVE-2026-12866" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.