CVE-2026-12343

MEDIUM

Published Oct 19, 2026 Modified Oct 23, 2026 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.

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CVSS v3.1 Score

6.5

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS — Exploit Prediction

0.0024

Probability of exploitation

0.15%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-400 Uncontrolled Resource Consumption

Affected Products

Vendor	Product	Versions
ibm	mq_operator	2.0.0 — 2.0.29
ibm	mq_operator	3.2.0 — 3.2.29
ibm	mq_operator	All
ibm	mq_operator	All
ibm	mq_operator	All
ibm	mq_operator	All
ibm	mq_operator	All
ibm	mq_operator	All
ibm	mq_operator	All
ibm	mq_operator	All
ibm	mq_operator	All
ibm	mq_operator	All
ibm	mq_operator	All
ibm	mq_operator	All
ibm	mq_operator	All
ibm	mq_operator	All
ibm	mq_operator	All
ibm	mq_operator	All
ibm	mq_operator	All
ibm	mq_operator	All
ibm	mq_operator	All
ibm	mq_operator	All
ibm	mq_operator	All
ibm	mq_operator	All
ibm	mq_operator	All
ibm	mq_operator	All
ibm	mq_operator	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All
ibm	supplied_mq_advanced_container_images	All

References

Advisories & Patches

https://www.ibm.com/support/pages/node/7292667

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. It has a CVSS v3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2026-12343? +

CVE-2026-12343 has a CVSS v3.1 score of 6.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0024, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-12343? +

CVE-2026-12343 affects products from ibm, specifically: mq_operator, supplied_mq_advanced_container_images. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-12343? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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Quick Facts

CVSS Score: 6.5
Severity: MEDIUM
EPSS: 0.0024
Published: Oct 19, 2026

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