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Vulnerability · Published Nov 4, 2026 · Assigned by ibm

CVE-2026-11376IBM MQ is affected by a denial of service vulnerability

High 8.8

In plain English

A high-severity integer overflow in MQ from IBM. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 26% of all known vulnerabilities).

Severity (CVSS 3.1)8.8High
Exploit odds (30 days)0.3%top 73.9% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

IBM MQ 9.2.0.0 through 9.2.0.44 LTS, 9.3.0.0 through 9.3.0.42 LTS, 9.4.0.0 through 9.4.0.26 LTS, 9.4.0.0 through 9.4.5.1 CD, and 10.0.0.0 through 10.0.0.5 LTS and CD could allow an authenticated attacker to cause a denial of service or potentially execute arbitrary code due to an integer overflow when processing subscription requests with crafted buffer size values.

Affected products (as reported)

VendorProductVersions
IBM MQ 9.2.0.0 – through 9.2.0.449.3.0.0 – through 9.3.0.429.4.0.0 – through 9.4.0.269.4.0.0 – through 9.4.5.110.0.0.0 – through 10.0.0.5

Weakness: CWE-190 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References