CVE-2020-1896

9.8 criticalEPSS 2.5%

Critical (9.8) in facebook hermes. EPSS 2.5% chance of exploitation in the next 30 days.

A stack overflow vulnerability in Facebook Hermes 'builtin apply' prior to commit 86543ac47e59c522976b5632b8bf9a2a4583c7d2 (https://github.com/facebook/hermes/commit/86543ac47e59c522976b5632b8bf9a2a4583c7d2) allows attackers to potentially execute arbitrary code via crafted JavaScript. Note that this is only exploitable if the application using Hermes permits evaluation of untrusted JavaScript. Hence, most React Native applications are not affected.

Severity

CVSS 3.1

9.8 critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 2.5% chance of exploitation in the next 30 days; higher than 84% of CVEs (scores of 2026-10-31)
CWEs: CWE-787, CWE-121
Published: 2021-02-02
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

facebook:hermes

References

https://github.com/facebook/hermes/commit/86543ac47e59c522976b5632b8bf9a2a4583c7d2
https://www.facebook.com/security/advisories/cve-2020-1896
https://github.com/facebook/hermes/commit/86543ac47e59c522976b5632b8bf9a2a4583c7d2
https://www.facebook.com/security/advisories/cve-2020-1896

Check your stack JSON