CVE-2026-75880: An authenticated client could attach a consumer with a selector containing crafted wildcard usage that results

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MEDIUM 6.5WATCHLISTUPGRADE

CVE-2026-75880 is a medium-severity flaw (CVSS 6.5) affecting artemis. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.7% (top 49%)
CISA exploited list	No
Weakness	CWE-1333
Published	2026-09-10
Last modified	2026-09-18

Publisher (CNA): Apache Software Foundation · Vendor: apache

Last updated 2026-09-18 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-10 05:17 UTCPublished CVE record published
2026-09-18 15:17 UTCUpdated Record last modified

apache artemis UPGRADE

Affected: >= 1.0.0 and < 2.44.0 · >= 2.50.0 and < 2.57.0

Fixed in: 2.44.0, 2.57.0

Safe to downgrade to: a release before 1.0.0

1. Check installed version

apt-cache policy artemis || rpm -q artemis || artemis --version

2. UPGRADE to 2.44.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade artemis

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade artemis

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 1.0.0 (Debian / Ubuntu)

apt-cache madison artemis sudo apt install artemis=<VERSION_BEFORE_1.0.0> sudo apt-mark hold artemis

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list artemis sudo dnf downgrade artemis-<VERSION_BEFORE_1.0.0> sudo dnf versionlock add artemis

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-75880?

artemis: upgrade to 2.44.0, 2.57.0. Exact commands for each OS are on this page.

Is CVE-2026-75880 being exploited?

CVE-2026-75880 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-75880 affect?

CVE-2026-75880 affects artemis. Severity is medium (CVSS 6.5). 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. Thi

How urgent is CVE-2026-75880?

Priority 41/100. On your watchlist

Software pages

Apache ActiveMQ vulnerabilities

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References

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