CVE-2023-23556

CRITICAL

Facebook Hermes < 2023-02-02 - Remote Code Execution via BigInt Conversion Out-of-Bounds Write

Title source: llm

Description

An error in BigInt conversion to Number in Hermes prior to commit a6dcafe6ded8e61658b40f5699878cd19a481f80 could have been used by a malicious attacker to execute arbitrary code due to an out-of-bound write. Note that this bug is only exploitable in cases where Hermes is used to execute untrusted JavaScript. Hence, most React Native applications are not affected.

References (2)

Core 2

Core References

Patch, Vendor Advisory x_refsource_confirm

https://www.facebook.com/security/advisories/cve-2023-23556

Patch x_refsource_misc

https://github.com/facebook/hermes/commit/a6dcafe6ded8e61658b40f5699878cd19a481f80

View Patch ZIP pw:eip

Scores

CVSS v3 9.8

EPSS 0.0089

EPSS Percentile 55.0%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment

Exploitation none

Automatable yes

Technical Impact total

Details

CWE

CWE-787

Status published

Products (1)

facebook/hermes < 2023-02-02

Published May 18, 2023

Tracked Since Feb 18, 2026