CVE-2023-30470: facebook hermes Use After Free

Vulnerability summary

CVE-2023-30470 is a critical (CVSS 9.8) Use After Free vulnerability in facebook hermes. EPSS estimates a 1.25% chance of exploitation in the next 30 days, higher than 69.1% of scored vulnerabilities.

Timeline

1. 18-05-2023
   PublishedVulnerability first disclosed.
2. 21-01-2025
   Last modifiedVulnerability information updated.

Description

A use-after-free related to unsound inference in the bytecode generation when optimizations are enabled for Hermes prior to commit da8990f737ebb9d9810633502f65ed462b819c09 could have been used by an attacker to achieve remote code execution. Note that this is only exploitable in cases where Hermes is used to execute untrusted JavaScript. Hence, most React Native applications are not affected.

• CWE-416Use After FreeThe product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.