What’s Vulnerable › Vulnerabilities
CVE-2026-12343: IBM MQ Denial of Service
- Severity: medium (CVSS 6.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-10-19 · updated 2026-10-23
- Weakness: CWE-400
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.
Affected products
- IBM MQ Operator: from 2.0.0 through 2.0.29; from 3.2.0 through 3.2.29; 3.3.0, 3.4.0, 3.4.1, 3.5.0, 3.5.1, 3.5.2 (+19) (and their updates)
- IBM supplied MQ Advanced container images: 9.4.1.0-r1, 9.4.1.0-r2, 9.4.1.1-r1, 9.4.2.0-r1, 9.4.2.0-r2, 9.4.2.1-r1 (+75); 9.4.0.12 (and their updates)
References
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