---
title: "CVE-2026-12148: IBM MQ Operator - Insecure Deserialization"
description: "IBM MQ Operator contains an insecure deserialization vulnerability caused by unrestricted Java deserialization in MQ Classes for Java, letting authenticated attackers cause denial of service or execute arbitrary code."
url: https://panop.io/threat-heartbeat/CVE-2026-12148/
---

# CVE-2026-12148 IBM MQ Operator - Insecure Deserialization

IBM MQ Operator contains an insecure deserialization vulnerability caused by unrestricted Java deserialization in MQ Classes for Java, letting authenticated attackers cause denial of service or execute arbitrary code.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-12148)

## Details

Type

Insecure Deserialization

Impact

Remote Code Execution, Denial Of Service

CVSS vector

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

Published

19 October 2026

Updated

20 October 2026

Weakness

[CWE-502](https://cwe.mitre.org/data/definitions/502.html)

## Vendor fix

Update to the latest version of IBM MQ Operator.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-12148](https://nvd.nist.gov/vuln/detail/CVE-2026-12148)
- [https://www.ibm.com/support/pages/node/7292667](https://www.ibm.com/support/pages/node/7292667)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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