CVE-2023-30470

Name: CVE-2023-30470
Creator: NVD / NIST
Published: 2023-05-18T22:15:09.93+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.25%

Last modified Jun 17, 2026

CVE-2023-30470 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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. EPSS estimates a 1.25% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

1.25%

65.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Facebook	Hermes	All versions

References

https://github.com/facebook/hermes/commit/da8990f737ebb9d9810633502f65ed462b819c09Patch
https://www.facebook.com/security/advisories/cve-2023-30470Patch, Vendor Advisory
https://github.com/facebook/hermes/commit/da8990f737ebb9d9810633502f65ed462b819c09Patch
https://www.facebook.com/security/advisories/cve-2023-30470Patch, Vendor Advisory

Timeline

Published: May 18, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-30470?

How severe is CVE-2023-30470?

CVE-2023-30470 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.25% probability of exploitation in the next 30 days.

How do I fix CVE-2023-30470?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-30470?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST