What is CVE-2023-38961?

CVE-2023-38961 is a critical-severity vulnerability in Jerryscript, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2023-08-21.

How severe is CVE-2023-38961?

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

Buffer overflow in Jerryscript

CVE-2023-38961

Buffer Overflwo vulnerability in JerryScript Project jerryscript v.3.0.0 allows a remote attacker to execute arbitrary code via the scanner_is_context_needed component in js-scanner-until.c.

Vulnerability class: Buffer Overflow

Published 2023-08-21 · last modified 2026-06-17.

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.

EPSS exploit prediction

EPSS: 0.015 (72.7th percentile), scored 2026-10-08.

Low probability of exploitation in the next 30 days, but still tracked. 73rd percentile — 72.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.014 · newest: 0.015 · change: +0.000

Affected products

Jerryscript — versions 3.0.0

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

github.com/jerryscript-project/jerryscript/issues/5092 (Exploit, Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2023-38961?: CVE-2023-38961 is a critical-severity vulnerability in Jerryscript, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2023-08-21.
How severe is CVE-2023-38961?: Critical severity. CVSS v3 base score is 9.8 out of 10.