CVE-2023-30470

9.8 criticalEPSS 1.2%

Critical (9.8) in facebook hermes. EPSS 1.2% chance of exploitation in the next 30 days.

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.

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: 1.2% chance of exploitation in the next 30 days; higher than 69% of CVEs (scores of 2026-10-31)
CWE: CWE-416
Published: 2023-05-18
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

facebook:hermes

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

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