CVE-2022-40138

9.8 criticalEPSS 1.2%

Critical (9.8) in facebook hermes. EPSS 1.2% chance of exploitation in the next 30 days.

An integer conversion error in Hermes bytecode generation, prior to commit 6aa825e480d48127b480b08d13adf70033237097, could have been used to perform Out-Of-Bounds operations and subsequently execute arbitrary code. Note that this is only exploitable in cases where Hermes is used to execute untrusted JavaScript. Hence, most React Native applications are not affected.

Severity

CVSS 3.1

9.8 critical

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

EPSS: 1.2% chance of exploitation in the next 30 days; higher than 68% of CVEs (scores of 2026-10-31)
CWE: CWE-681
Published: 2022-10-11
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

facebook:hermes

References

https://github.com/facebook/hermes/commit/6aa825e480d48127b480b08d13adf70033237097
https://www.facebook.com/security/advisories/CVE-2022-40138
https://github.com/facebook/hermes/commit/6aa825e480d48127b480b08d13adf70033237097
https://www.facebook.com/security/advisories/CVE-2022-40138

Check your stack JSON