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Vulnerability · Published Nov 4, 2026 · Assigned by ibm

CVE-2026-12538IBM MQ Appliance is affected by an improper validation vulnerability

Medium 5.4

In plain English

A medium-severity security flaw in MQ Appliance 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 27% of all known vulnerabilities).

Severity (CVSS 3.1)5.4Medium
Exploit odds (30 days)0.3%top 73.4% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

IBM MQ 9.4.0.0 to 9.4.0.26, 9.4.1.0 to 9.4.5.3, and 10.0.0.1 to 10.0.0.5 could allow an authenticated attacker to obtain sensitive information or cause a denial of service due to improper validation of message header structure length fields.

Affected products (as reported)

VendorProductVersions
IBM MQ Appliance 9.4.0.0 – through 9.4.0.269.4.1.0 – through 9.4.5.310.0.0.1 – through 10.0.0.5

Weakness: CWE-124 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L

References