A logic vulnerability when handling the SaveGeneratorLong instruction in Facebook Hermes prior to commit b2021df620824627f5a8c96615edbd1eb7fdddfc allows attackers to potentially read out of bounds or theoretically execute arbitrary code via crafted JavaScript. Note that this is only exploitable if the application using Hermes permits evaluation of untrusted JavaScript. Hence, most React Native applications are not affected.

Affected Packages

npm hermes-engine

Affected versions: 0 (fixed in 0.7.2)

Related CVEs

CVE-2020-1914

Key Information

GHSA ID

GHSA-327c-qx3v-h673

Published

May 24, 2022 5:30 PM

Last Modified

June 27, 2022 5:05 PM

CVSS Score

9.0 /10

Primary Ecosystem

npm

Primary Package

hermes-engine

GitHub Reviewed

✓ Yes

Dataset

Last updated: September 10, 2025 6:31 AM

Data from GitHub Advisory Database. This information is provided for research and educational purposes.