Error in BigInt Conversion in Hermes Engine by Facebook
CVE-2023-23556

9.8CRITICAL

Key Information:

Vendor

Facebook

Status
Hermes
Vendor
CVE Published:
18 May 2023

What is CVE-2023-23556?

A flaw in the Hermes JavaScript engine allows for improper handling of BigInt conversions to Number. This vulnerability can potentially permit a malicious actor to execute arbitrary code through out-of-bounds write conditions. It is important to note that this issue primarily impacts applications using untrusted JavaScript in the Hermes environment, thus limiting its risk to most React Native applications.

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Deploy the Patch

Affected Version(s)

Hermes 0

References

https://www.facebook.com/security/advisories/cve-2023-23556
x_refsource_CONFIRM
https://github.com/facebook/hermes/commit/a6dcafe6ded8e61...
x_refsource_MISC

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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