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CVE-2020-1911

Critical

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.

SeverityCritical
CVSS9.8
Exploit probability—
ProductFacebook Hermes
PublishedSep 4, 2020
First seenSep 4, 2020
Weakness typeCWE-843CWE-843

How to fix

Update
  • facebook hermes0.4.3 or later
  • hermes-engine0.5.2 or later

Affected products

ProductAffected versionsFixed in
facebook hermesv < 0.4.30.4.3
hermes-enginenpmv < 0.5.20.5.2

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