CVE-2026-10027: IBM MQ could allow a remote attacker to cause a denial of service or execute arbitrary code due to a buffer ov

This month

HIGH 8.1REMOTEUPGRADE

CVE-2026-10027 is a high-severity flaw (CVSS 8.1) affecting mq. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

IBM MQ could allow a remote attacker to cause a denial of service or execute arbitrary code due to a buffer overflow when processing malformed compressed data on channels configured with compression enabled.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.8% (top 44%)
CISA exploited list	No
Weakness	CWE-787
Published	2026-09-18
Last modified	2026-09-23

Publisher (CNA): IBM Corporation · Vendor: ibm

Last updated 2026-09-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-18 16:17 UTCPublished CVE record published
2026-09-23 18:32 UTCUpdated Record last modified

ibm mq UPGRADE

Affected: >= 9.1.0.0 and <= 9.1.0.37 · >= 9.2.0.0 and <= 9.2.0.43 · >= 9.3.0.0 and <= 9.3.0.41 · >= 9.3.0.0 and <= 9.3.5.1 · >= 9.4.0.0 and <= 9.4.0.25 · >= 9.4.0.0 and <= 9.4.5.1 · 10.0.0.0

Fixed in: newer than 9.4.5.1

Safe to downgrade to: a release before 9.1.0.0

1. Check installed version

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

2. UPGRADE to newer than 9.4.5.1 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mq

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 9.1.0.0 (Debian / Ubuntu)

apt-cache madison mq sudo apt install mq=<VERSION_BEFORE_9.1.0.0> sudo apt-mark hold mq

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

dnf --showduplicates list mq sudo dnf downgrade mq-<VERSION_BEFORE_9.1.0.0> sudo dnf versionlock add mq

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-2026-10027?

mq: upgrade to newer than 9.4.5.1. Exact commands for each OS are on this page.

Is CVE-2026-10027 being exploited?

CVE-2026-10027 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-2026-10027 affect?

CVE-2026-10027 affects mq. Severity is high (CVSS 8.1). IBM MQ could allow a remote attacker to cause a denial of service or execute arbitrary code due to a buffer overflow when processing malformed compressed data on channels configured with compression enabled.

How urgent is CVE-2026-10027?

Priority 47/100. High severity; Remotely exploitable, no login, no user action

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References

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