major vulnerability· requires attention

Affects IBM MQ, widely used enterprise messaging; exploitation can disrupt messaging and expose sensitive data across organizations.

Applications

CVE-2026-11726

8.1

High

EPSS 0.46%Patch available

Authenticated header-offset flaw in IBM MQ (HPE NonStop) allows data disclosure or DoS

exploited

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

fix

Patch available see the advisory in the references

likelihood

EPSS 0.46%top 60% of scored CVEs

Published 18 Sept 2026Analysed here 21 Sept 2026CVSS scored by the publisher (CNA)

common questions

Is CVE-2026-11726 being exploited?

Not confirmed. CVE-2026-11726 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 0.46% probability of exploitation in the next 30 days.

How severe is CVE-2026-11726?

CVE-2026-11726 is rated High with a CVSS score of 8.1. 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-2026-11726?

Yes. A fix has been recorded for CVE-2026-11726. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.

What does CVE-2026-11726 affect?

CVE-2026-11726 affects IBM MQ for HPE NonStop 8.1.0 through 8.1.0.40. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.

What should I do about CVE-2026-11726?

Apply IBM patch per advisory; restrict MQ access and enforce strong authentication.

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

executive summary

technical analysis

affected

IBM MQ for HPE NonStop 8.1.0 through 8.1.0.40

impact

Authenticated attacker can craft messages to read sensitive memory or crash the MQ service (denial of service).

action required

Patch when possible

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: partial

Assessed by CISA 19 Sept 2026 (SSVC 2.0.3).

timeline

18 Sept 2026Published
19 Sept 2026CISA SSVC assessment: exploitation none · 1 day later
19 Sept 2026CVE record last updated · same day later
21 Sept 2026Analysed by vulneraibility.com · 2 days 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/7287707

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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