What is CVE-2026-75880?

CVE-2026-75880 is a medium-severity vulnerability in Apache Artemis, classified under Inefficient Regular Expression Complexity. CVSS score: 6.5/10. Published 2026-09-10.

How severe is CVE-2026-75880?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Apache Artemis

CVE-2026-75880

An authenticated client could attach a consumer with a selector containing crafted wildcard usage that results in excessive evaluation during message delivery attempts, occupying a shared broker thread and leading to denial of service. This issue affects Apache Artemis: from 2.50.0 through 2.56.0; Apache ActiveMQ Artemis: from 1.0.0 through 2.44.0. Users are recommended to upgrade to version 2.57.0, which fixes this issue.

Vulnerability class: ReDoS (Regular Expression Denial of Service)

Published 2026-09-10 · last modified 2026-09-18.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.007 (50.7th percentile), scored 2026-10-25.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 50.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-1333 — Inefficient Regular Expression Complexity

References

lists.apache.org/thread/db34g9qoxd8p08086cr95683fkb8wm5r (vendor-advisory, Mailing List, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2026-75880?: CVE-2026-75880 is a medium-severity vulnerability in Apache Artemis, classified under Inefficient Regular Expression Complexity. CVSS score: 6.5/10. Published 2026-09-10.
How severe is CVE-2026-75880?: Medium severity. CVSS v3 base score is 6.5 out of 10.