CVE-2022-40138

Name: CVE-2022-40138
Creator: NVD / NIST
Published: 2022-10-11T02:15:08.857+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 0.89%

Last modified Jun 17, 2026

CVE-2022-40138 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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. EPSS estimates a 0.89% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

0.89%

54.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Facebook	Hermes	< 2022-09-27

References

https://github.com/facebook/hermes/commit/6aa825e480d48127b480b08d13adf70033237097Patch, Third Party Advisory
https://www.facebook.com/security/advisories/CVE-2022-40138Vendor Advisory
https://github.com/facebook/hermes/commit/6aa825e480d48127b480b08d13adf70033237097Patch, Third Party Advisory
https://www.facebook.com/security/advisories/CVE-2022-40138Vendor Advisory

Timeline

Published: Oct 11, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-40138?

How severe is CVE-2022-40138?

CVE-2022-40138 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.89% probability of exploitation in the next 30 days.

How do I fix CVE-2022-40138?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-40138?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST