What is CVE-2021-26195?

CVE-2021-26195 is a high-severity vulnerability in Jerryscript, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2021-06-10.

How severe is CVE-2021-26195?

High severity. CVSS v3 base score is 8.8 out of 10.

Buffer overflow in Jerryscript

CVE-2021-26195

An issue was discovered in JerryScript 2.4.0. There is a heap-buffer-overflow in lexer_parse_number in js-lexer.c file.

Vulnerability class: Buffer Overflow

Published 2021-06-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.011 (66.3th percentile), scored 2026-11-01.

Low probability of exploitation in the next 30 days, but still tracked. 66th percentile — 66.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Jerryscript — versions 2.4.0

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

github.com/jerryscript-project/jerryscript/issues/4442 (Exploit, Patch, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2021-26195?: CVE-2021-26195 is a high-severity vulnerability in Jerryscript, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2021-06-10.
How severe is CVE-2021-26195?: High severity. CVSS v3 base score is 8.8 out of 10.