GHSA-fqg8-vfv7-8fj8 · Severity: critical · Ecosystem: npm — JSONata expression can pollute the "Object" prototype
JSONata is a JSON query and transformation language. Starting in version 1.4.0 and prior to version 1.8.7 and 2.0.4, a malicious expression can use the transform operator to override properties on the `Object` constructor and prototype. This may lead to denial of service, remote code execution or other unexpected behavior in applications that evaluate user-provided JSONata expressions. This issue has been fixed in JSONata versions 1.8.7 and 2.0.4. Applications that evaluate user-provided expressions should update ASAP to prevent exploitation. As a workaround, one may apply the patch manually.
Conclusion & alert: CVE-2024-27307 is rated Moderate Risk (64/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 1.42%). Mandatory action: Review affected assets and schedule remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-06-15 | 0.89% | 1.42% | +0.53% |
| 2 | 2026-04-07 | 1.98% | 0.89% | -1.09% |
| 3 | 2026-04-06 | — | 1.98% | — |
Full EPSS history (15 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 9.8 | 3.1 | CRITICAL |
|
3.9 | 5.9 | [email protected] |
GHSA-fqg8-vfv7-8fj8 · Severity: critical · Ecosystem: npm — JSONata expression can pollute the "Object" prototype
| vendor | priority | summary | link |
|---|---|---|---|
redhat
|
high | — | https://access.redhat.com/security/cve/CVE-2024-27307 |