Affects IBM MQ, widely used enterprise messaging; exploitation can disrupt messaging and expose sensitive data across organizations.
CVE-2026-11726
Authenticated header-offset flaw in IBM MQ (HPE NonStop) allows data disclosure or DoS
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.
Authenticated attacker can craft messages to read sensitive memory or crash the MQ service (denial of service).
Patch when possible
- 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.