CVE-2023-24833: Facebook Hermes

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

A use-after-free in BigIntPrimitive addition in Hermes prior to commit a6dcafe6ded8e61658b40f5699878cd19a481f80 could have been used by an attacker to leak raw data from Hermes VM’s heap. 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: before 2023-02-02 (fixed in 2023-02-02)

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