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CVE-2026-12666

IBM MQ Java messaging is vulnerable to XML external entity injection

CVSS 3.1 8.1 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-12666

Published

IBM MQ 9.1.0.0 through 9.1.0.37 LTS, 9.2.0.0 through 9.2.0.43 LTS, 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 CD, and 10.0.0.0 Classes for Java could allow an authenticated attacker to obtain sensitive information or cause a denial of service due to XML external entity injection in MQRFH2 header processing.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-12666

Published

MQ

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "IBM",
                    "product": "MQ",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "9.1.0.0",
                            "lessThanOrEqual": "9.1.0.37 LTS",
                            "versionType": "semver"
                        },
                        {
                            "status": "affected",
                            "version": "9.2.0.0",
                            "lessThanOrEqual": "9.2.0.43 LTS",
                            "versionType": "semver"
                        },
                        {
                            "status": "affected",
                            "version": "9.3.0.0",
                            "lessThanOrEqual": "9.3.0.41 LTS",
                            "versionType": "semver"
                        },
                        {
                            "status": "affected",
                            "version": "9.3.0.0",
                            "lessThanOrEqual": "9.3.5.1 CD",
                            "versionType": "semver"
                        },
                        {
                            "status": "affected",
                            "version": "9.4.0.0",
                            "lessThanOrEqual": "9.4.0.25 LTS",
                            "versionType": "semver"
                        },
                        {
                            "status": "affected",
                            "version": "9.4.0.0",
                            "lessThanOrEqual": "9.4.5.1 CD",
                            "versionType": "semver"
                        },
                        {
                            "status": "affected",
                            "version": "10.0.0.0"
                        }
                    ],
                    "cpes": [
                        "cpe:2.3:a:ibm:mq:9.1.0.0:*:*:*:*:*:*:*",
                        "cpe:2.3:a:ibm:mq:9.1.0.37:*:*:*:*:*:*:*",
                        "cpe:2.3:a:ibm:mq:9.2.0.0:*:*:*:*:*:*:*",
                        "cpe:2.3:a:ibm:mq:9.2.0.43:*:*:*:*:*:*:*",
                        "cpe:2.3:a:ibm:mq:9.3.0.0:*:*:*:*:*:*:*",
                        "cpe:2.3:a:ibm:mq:9.3.0.41:*:*:*:*:*:*:*",
                        "cpe:2.3:a:ibm:mq:9.3.5.1:*:*:*:*:*:*:*",
                        "cpe:2.3:a:ibm:mq:9.4.0.0:*:*:*:*:*:*:*",
                        "cpe:2.3:a:ibm:mq:9.4.0.25:*:*:*:*:*:*:*",
                        "cpe:2.3:a:ibm:mq:9.4.5.1:*:*:*:*:*:*:*",
                        "cpe:2.3:a:ibm:mq:10.0.0.0:*:*:*:*:*:*:*"
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON