CVE-2026-12343
MEDIUMCVSS 6.5/10EPSS 0.24%
Last modified
CVE-2026-12343 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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.. EPSS estimates a 0.24% chance of exploitation in the next 30 days.
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.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Ibm | Mq Operator | >= 2.0.0, <= 2.0.29 | — |
| Ibm | Mq Operator | >= 3.2.0, <= 3.2.29 | — |
| Ibm | Mq Operator | 3.3.0 | — |
| Ibm | Mq Operator | 3.4.0 | — |
| Ibm | Mq Operator | 3.4.1 | — |
| Ibm | Mq Operator | 3.5.0 | — |
| Ibm | Mq Operator | 3.5.1 | — |
| Ibm | Mq Operator | 3.5.2 | — |
| Ibm | Mq Operator | 3.5.3 | — |
| Ibm | Mq Operator | 3.6.0 | — |
| Ibm | Mq Operator | 3.6.1 | — |
| Ibm | Mq Operator | 3.6.2 | — |
| Ibm | Mq Operator | 3.6.3 | — |
| Ibm | Mq Operator | 3.6.4 | — |
| Ibm | Mq Operator | 3.7.0 | — |
| Ibm | Mq Operator | 3.7.1 | — |
| Ibm | Mq Operator | 3.7.2 | — |
| Ibm | Mq Operator | 3.8.0 | — |
| Ibm | Mq Operator | 3.8.1 | — |
| Ibm | Mq Operator | 3.9.0 | — |
| Ibm | Mq Operator | 3.9.1 | — |
| Ibm | Mq Operator | 3.9.2 | — |
| Ibm | Mq Operator | 4.0.0 | — |
| Ibm | Mq Operator | 4.0.1 | — |
| Ibm | Mq Operator | 4.0.2 | — |
| Ibm | Mq Operator | 4.0.3 | — |
| Ibm | Mq Operator | 4.0.4 | — |
| Ibm | Supplied Mq Advanced Container Images | 9.4.1.0 | R1 |
| Ibm | Supplied Mq Advanced Container Images | 9.4.1.1 | R1 |
| Ibm | Supplied Mq Advanced Container Images | 9.4.2.0 | R1 |
| Ibm | Supplied Mq Advanced Container Images | 9.4.2.1 | R1 |
| Ibm | Supplied Mq Advanced Container Images | 9.4.3.0 | R1 |
| Ibm | Supplied Mq Advanced Container Images | 9.4.3.1 | R1 |
| Ibm | Supplied Mq Advanced Container Images | 9.4.4.0 | R1 |
| Ibm | Supplied Mq Advanced Container Images | 9.4.4.1 | R1 |
| Ibm | Supplied Mq Advanced Container Images | 9.4.5.0 | R1 |
| Ibm | Supplied Mq Advanced Container Images | 9.4.5.1 | R1 |
| Ibm | Supplied Mq Advanced Container Images | 10.0.0.0 | R1 |
| Ibm | Supplied Mq Advanced Container Images | 10.0.0.5 | R1 |
| Ibm | Supplied Mq Advanced Container Images | 9.3.0.0 | R1 |
| Ibm | Supplied Mq Advanced Container Images | 9.3.0.1 | R1 |
| Ibm | Supplied Mq Advanced Container Images | 9.3.0.3 | R1 |
| Ibm | Supplied Mq Advanced Container Images | 9.3.0.4 | R1 |
| Ibm | Supplied Mq Advanced Container Images | 9.3.0.5 | R1 |
| Ibm | Supplied Mq Advanced Container Images | 9.3.0.6 | R1 |
| Ibm | Supplied Mq Advanced Container Images | 9.3.0.10 | R1 |
| Ibm | Supplied Mq Advanced Container Images | 9.3.0.11 | R1 |
| Ibm | Supplied Mq Advanced Container Images | 9.3.0.15 | R1 |
| Ibm | Supplied Mq Advanced Container Images | 9.3.0.16 | R1 |
| Ibm | Supplied Mq Advanced Container Images | 9.3.0.17 | R1 |
Showing 50 of 67 affected configurations. See NVD for the full list.
References
- https://www.ibm.com/support/pages/node/7292667Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-12343?
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.
How severe is CVE-2026-12343?
CVE-2026-12343 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.24% probability of exploitation in the next 30 days.
How do I fix CVE-2026-12343?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2026-12343?
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