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CVE-2023-23557

Critical

Description

An error in Hermes' algorithm for copying objects properties prior to commit a00d237346894c6067a594983be6634f4168c9ad could be used by a malicious attacker to execute arbitrary code via type confusion. Note that this is only exploitable in cases where Hermes is used to execute untrusted JavaScript. Hence, most React Native applications are not affected.

SeverityCritical
CVSS9.8
Exploit probability—
ProductFacebook Hermes
PublishedMay 18, 2023
First seenMay 18, 2023
Weakness typeCWE-843CWE-843

How to fix

Update
  • facebook hermes2023-01-10 or later

Affected products

ProductAffected versionsFixed in
facebook hermesv < 2023-01-102023-01-10

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