CVE-2023-30470

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-05-18 · updated 2026-06-17
Weakness: CWE-416

Description

A use-after-free related to unsound inference in the bytecode generation when optimizations are enabled for Hermes prior to commit da8990f737ebb9d9810633502f65ed462b819c09 could have been used by an attacker to achieve remote code execution. 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: all versions

References

https://github.com/facebook/hermes/commit/da8990f737ebb9d9810633502f65ed462b819c09
https://www.facebook.com/security/advisories/cve-2023-30470
https://github.com/facebook/hermes/commit/da8990f737ebb9d9810633502f65ed462b819c09
https://www.facebook.com/security/advisories/cve-2023-30470

Get alerted when CVE-2023-30470 or the next vulnerability affects your stack