major vulnerability· requires attention

Affects widely used enterprise middleware (IBM MQ); high-severity RCE/DoS risk that can disrupt enterprise messaging infrastructure.

Infrastructure

CVE-2026-11381

8.8

High

EPSS 0.59%Patch available

Auth. flaw in IBM MQ allows DoS or potential code execution via crafted distribution lists.

exploited

No known exploitation not in CISA KEV as of our last sync

fix

Patch available see the advisory in the references

likelihood

EPSS 0.59%top 52% of scored CVEs

Published 18 Sept 2026Analysed here 19 Sept 2026CVSS scored by the publisher (CNA)

common questions

Is CVE-2026-11381 being exploited?

Not confirmed. CVE-2026-11381 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.59% probability of exploitation in the next 30 days.

How severe is CVE-2026-11381?

CVE-2026-11381 is rated High with a CVSS score of 8.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.

Is there a patch for CVE-2026-11381?

Yes. A fix has been recorded for CVE-2026-11381. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.

What does CVE-2026-11381 affect?

CVE-2026-11381 affects IBM MQ, IBM MQ Server / Queue Manager, IBM WebSphere MQ. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.

What should I do about CVE-2026-11381?

Apply IBM's security update immediately; restrict MQ access and monitor logs.

Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.

executive summary

technical analysis

affected

IBM MQIBM MQ Server / Queue ManagerIBM WebSphere MQ

impact

Authenticated attacker can send crafted message distribution lists to crash IBM MQ or achieve arbitrary code execution in the MQ server process.

action required

Immediate action required

affected versions

IBM MQ for HPE NonStop

affected>= 8.1.0 and <= 8.1.0.40

As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.

cisa ssvc

exploitation: none
automatable: no
technical impact: total

Assessed by CISA 18 Sept 2026 (SSVC 2.0.3).

timeline

18 Sept 2026CISA SSVC assessment: exploitation none
18 Sept 2026Published · 1 day later
19 Sept 2026CVE record last updated · same day later
19 Sept 2026Analysed by vulneraibility.com · same day later

how to fix

Remediation steps are tailored for users whose stack is affected. Add this technology to your stack to see the fix checklist.

references

NVD CVE.org CVE Details Source

1 reference in the CVE record: 1 patch

Patchibm.com /support/pages/node/7287706

sources

CVE List (CVE.org): description, affected versions, references; CVE Terms of Use
NVD: CVSS and CPE data
CISA Vulnrichment (ADP): SSVC decision points
FIRST EPSS: exploit probability and percentile
Summary, impact and triage tags: written by our AI analysis pipeline from the sources above. Check them against the sources.

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