What’s Vulnerable › Vulnerabilities

CVE-2023-24833

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-05-18 · updated 2026-06-17
• Weakness: CWE-416

Description

A use-after-free in BigIntPrimitive addition in Hermes prior to commit a6dcafe6ded8e61658b40f5699878cd19a481f80 could have been used by an attacker to leak raw data from Hermes VM’s heap. Note that this is only exploitable in cases where Hermes is used to execute untrusted JavaScript. Hence, most React Native applications are not affected.

Affected products

• Facebook Hermes: before 2023-02-02 — fixed in 2023-02-02

How to fix

Upgrade to a fixed version: Facebook Hermes 2023-02-02. Check the vendor advisory for mitigations.

References

• https://github.com/facebook/hermes/commit/a6dcafe6ded8e61658b40f5699878cd19a481f80
• https://www.facebook.com/security/advisories/cve-2023-24833
• https://github.com/facebook/hermes/commit/a6dcafe6ded8e61658b40f5699878cd19a481f80
• https://www.facebook.com/security/advisories/cve-2023-24833

Get alerted when CVE-2023-24833 or the next vulnerability affects your stack