CVE-2026-12343
Medium
Description
IBM MQ could allow an authenticated attacker to cause a denial of service due to improper validation of RFH2 message header fields in queued publish/subscribe operations.
SeverityMedium
CVSS6.5
Exploit probability—
Product
Ibm Mq Operator
PublishedOct 19, 2026
First seenOct 19, 2026
Weakness typeCWE-400Uncontrolled resource consumption
How to fix
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| ibm mq_operator | 2.0.0 ≤ v ≤ 2.0.29, 3.2.0 ≤ v ≤ 3.2.29, 3.3.0, 3.4.0, 3.4.1, 3.5.0, 3.5.1, 3.5.2, 3.5.3, 3.6.0, 3.6.1, 3.6.2, 3.6.3, 3.6.4, 3.7.0, 3.7.1, 3.7.2, 3.8.0, 3.8.1, 3.9.0, 3.9.1, 3.9.2, 4.0.0, 4.0.1, 4.0.2, 4.0.3, 4.0.4 | — |
| ibm supplied_mq_advanced_container_images | 9.4.1.0, 9.4.1.1, 9.4.2.0, 9.4.2.1, 9.4.3.0, 9.4.3.1, 9.4.4.0, 9.4.4.1, 9.4.5.0, 9.4.5.1, 10.0.0.0, 10.0.0.5, 9.3.0.0, 9.3.0.1, 9.3.0.3, 9.3.0.4, 9.3.0.5, 9.3.0.6, 9.3.0.10, 9.3.0.11, 9.3.0.15, 9.3.0.16, 9.3.0.17, 9.3.0.20, 9.3.0.21, 9.3.0.25, 9.4.0.0, 9.4.0.5, 9.4.0.6, 9.4.0.7, 9.4.0.10, 9.4.0.11, 9.4.0.12, 9.4.0.15, 9.4.0.16, 9.4.0.17, 9.4.0.20, 9.4.0.21, 9.4.0.25, 9.4.0.26 | — |
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