What is CVE-2026-45205?

CVE-2026-45205 is a medium-severity vulnerability in Apache Commons Configuration, classified under Uncontrolled Recursion. CVSS score: 5.3/10. Published 2026-05-14.

How severe is CVE-2026-45205?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Apache Commons Configuration

CVE-2026-45205

Uncontrolled Recursion vulnerability in Apache Commons. When processing an untrusted configuration file, Commons Configuration will throw a StackOverflowError for YAML input with cycles. This issue affects Apache Commons: from 2.2 before 2.15.0. Users are recommended to upgrade to version 2.15.0, which fixes the issue.

Published 2026-05-14 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.008 (56.5th percentile), scored 2026-10-19.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 56.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.008 · change: +0.004

Affected products

Apache Commons Configuration
Apache Software Foundation Commons Configuration — versions 2.2

Weakness classification (CWE)

CWE-674 — Uncontrolled Recursion

References

github.com/apache/commons-configuration/pull/634 (Patch, patch, Issue Tracking)
lists.apache.org/thread/q3q3j10ohcqhs6o0rg1v7kz6kk27vtkk (vendor-advisory, Mailing List, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2026-45205?: CVE-2026-45205 is a medium-severity vulnerability in Apache Commons Configuration, classified under Uncontrolled Recursion. CVSS score: 5.3/10. Published 2026-05-14.
How severe is CVE-2026-45205?: Medium severity. CVSS v3 base score is 5.3 out of 10.