What is CVE-2026-12351?

CVE-2026-12351 is a critical-severity vulnerability in IBM Mq, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 9.8/10. Published 2026-09-15.

How severe is CVE-2026-12351?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in IBM Mq

CVE-2026-12351

IBM MQ 9.3.0.0 through 9.3.0.41 LTS, 9.3.0.0 through 9.3.5.1 CD, 9.4.0.0 through 9.4.0.25 LTS, 9.4.0.0 through 9.4.5.1 LTS, and 10.0.0.0 could allow a remote attacker to execute arbitrary code due to unsafe JNDI lookup processing when the IVT application is deployed.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Ibm Mq — versions 10.0.0.0

Weakness classification (CWE)

CWE-74 — Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection)

References

psirt@us.ibm.com (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-12351?: CVE-2026-12351 is a critical-severity vulnerability in IBM Mq, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 9.8/10. Published 2026-09-15.
How severe is CVE-2026-12351?: Critical severity. CVSS v3 base score is 9.8 out of 10.