Is CVE-2026-12343 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-12343?

CVE-2026-12343 has a CVSS v3 severity of MEDIUM (6.5).

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CVE-2026-12343

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.