What is CVE-2021-41959?

CVE-2021-41959 is a high-severity vulnerability in Jerryscript, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 7.5/10. Published 2022-05-03.

How severe is CVE-2021-41959?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Jerryscript

CVE-2021-41959

JerryScript Git version 14ff5bf does not sufficiently track and release allocated memory via jerry-core/ecma/operations/ecma-regexp-object.c after RegExp, which causes a memory leak.

Published 2022-05-03 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.012 (66.9th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 66.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: +0.000

Affected products

Jerryscript

Weakness classification (CWE)

CWE-401 — Missing Release of Memory after Effective Lifetime

References

github.com/jerryscript-project/jerryscript/issues/4781 (Exploit, Third Party Advisory, Issue Tracking)
github.com/jerryscript-project/jerryscript/pull/4787 (Exploit, Patch, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2021-41959?: CVE-2021-41959 is a high-severity vulnerability in Jerryscript, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 7.5/10. Published 2022-05-03.
How severe is CVE-2021-41959?: High severity. CVSS v3 base score is 7.5 out of 10.