What is CVE-2022-40138?

CVE-2022-40138 is a critical-severity vulnerability in Facebook Hermes, classified under Incorrect Conversion between Numeric Types. CVSS score: 9.8/10. Published 2022-10-11.

How severe is CVE-2022-40138?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Facebook Hermes

CVE-2022-40138

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 e…

EPSS: 0.009 (55.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Facebook Hermes — versions unspecified

Weakness classification (CWE)

CWE-681 — Incorrect Conversion between Numeric Types

References

cve-assign@fb.com (Patch, Third Party Advisory)
cve-assign@fb.com (Vendor Advisory)

Frequently asked questions

What is CVE-2022-40138?: CVE-2022-40138 is a critical-severity vulnerability in Facebook Hermes, classified under Incorrect Conversion between Numeric Types. CVSS score: 9.8/10. Published 2022-10-11.
How severe is CVE-2022-40138?: Critical severity. CVSS v3 base score is 9.8 out of 10.