CVE-2023-25933: Facebook Hermes

Critical severity, CVSS 9.8. EPSS: 0.9% chance of exploitation in the next 30 days.

A type confusion bug in TypedArray prior to commit e6ed9c1a4b02dc219de1648f44cd808a56171b81 could have been used by a malicious attacker to execute arbitrary code via untrusted JavaScript. Note that this is only exploitable in cases where Hermes is used to execute untrusted JavaScript. Hence, most React Native applications are not affected.

Affected products

• Facebook Hermes: affected versions not specified

Published 2023-05-18. Last modified 2026-06-17.