CVE-2020-1914
Critical
Description
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.
SeverityCritical
CVSS9.8
Exploit probability—
Product
Facebook Hermes
PublishedOct 8, 2020
First seenOct 8, 2020
Weakness typeCWE-670CWE-670
How to fix
Update
- facebook hermes2020-10-01 or later
- hermes-engine0.7.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| facebook hermes | v < 2020-10-01 | 2020-10-01 |
| hermes-enginenpm | v < 0.7.2 | 0.7.2 |
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