critical9.8
CVE-2020-1914
Always-Incorrect Control Flow Implementation in Facebook Hermes
Impact
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
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | hermes-engine | <= 0.7.1 | 0.7.2 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Hermes | before 2020-10-01 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/facebook/hermes/commit/b2021df620824627f5a8c96615edbd1eb7fdddfc
- https://www.facebook.com/security/advisories/cve-2020-1914
- https://github.com/advisories/GHSA-327c-qx3v-h673
- https://nvd.nist.gov/vuln/detail/CVE-2020-1914
- https://github.com/facebook/hermes/issues/373