Description
A type confusion vulnerability when resolving properties of JavaScript objects with specially-crafted prototype chains in Facebook Hermes prior to commit fe52854cdf6725c2eaa9e125995da76e6ceb27da allows attackers to potentially 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.
References (2)
Core 2
Core References
Third Party Advisory x_refsource_confirm
https://www.facebook.com/security/advisories/cve-2020-1911
Patch, Third Party Advisory x_refsource_confirm
https://github.com/facebook/hermes/commit/fe52854cdf6725c2eaa9e125995da76e6ceb27da
Scores
CVSS v3
9.8
EPSS
0.0102
EPSS Percentile
77.3%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Details
CWE
CWE-843
Status
published
Products (2)
facebook/hermes
< 0.4.3
npm/hermes-engine
0 - 0.5.2npm
Published
Sep 04, 2020
Tracked Since
Feb 18, 2026