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.
References (2)
Core 2
Core References
Patch, Vendor Advisory x_refsource_confirm
https://www.facebook.com/security/advisories/cve-2023-23557
Patch, Vendor Advisory x_refsource_misc
https://github.com/facebook/hermes/commit/a00d237346894c6067a594983be6634f4168c9ad
Scores
CVSS v3
9.8
EPSS
0.0077
EPSS Percentile
73.6%
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-843
Status
published
Products (1)
facebook/hermes
< 2023-01-10
Published
May 18, 2023
Tracked Since
Feb 18, 2026