What is CVE-2021-42859?

CVE-2021-42859 is a high-severity vulnerability in Mini-Xml Project, classified under Missing Release of Resource after Effective Lifetime. CVSS score: 7.5/10. Published 2022-05-26.

How severe is CVE-2021-42859?

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

Vulnerability in Mini-Xml Project

CVE-2021-42859

A memory leak issue was discovered in Mini-XML v3.2 that could cause a denial of service. NOTE: testing reports are inconsistent, with some testers seeing the issue in both the 3.2 release and in the October 2021 development code, but others not seeing the issue in the 3.2 release

Published 2022-05-26 · 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: 0.010 (62.0th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 62nd percentile — 62.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Mini-Xml Project — versions 3.2

Weakness classification (CWE)

CWE-772 — Missing Release of Resource after Effective Lifetime

References

github.com/michaelrsweet/mxml/issues/286 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2021-42859?: CVE-2021-42859 is a high-severity vulnerability in Mini-Xml Project, classified under Missing Release of Resource after Effective Lifetime. CVSS score: 7.5/10. Published 2022-05-26.
How severe is CVE-2021-42859?: High severity. CVSS v3 base score is 7.5 out of 10.