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CVE-2026-11728IBM MQ .NET client is vulnerable to remote code execution

Description

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 could allow a remote attacker to cause a denial of service or potentially execute arbitrary code in the client due to a heap buffer overflow when receiving messages from a malicious queue manager or through a man-in-the-middle attack.

Timeline

  1. ID reserved

    By ibm

  2. · 3 months later

    Published

  3. · 1 day later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-11728, by who scored it
Scored byCVSSScoreVector
ibmCNA (assigner)3.1High8.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVDNVD · Awaiting Analysis3.1High8.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (exploitation in 30 days)
0.35% · top 70% of all CVEs (13 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: total
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.1.

Affected products

  • IBM · MQ

    • affected 9.1.0.0 – ≤ 9.1.0.37 LTS
    • affected 9.2.0.0 – ≤ 9.2.0.43 LTS
    • affected 9.3.0.0 – ≤ 9.3.0.41 LTS
    • affected 9.3.0.0 – ≤ 9.3.5.1 CD
    • affected 9.4.0.0 – ≤ 9.4.0.25 LTS
    • affected 9.4.0.0 – ≤ 9.4.5.1 CD
    • affected 10.0.0.0

What to do

Solution: This issue was addressed under Known Issue DT473417 IBM MQ version 9.1 LTS Apply cumulative security update 9.1.0.38 IBM MQ version 9.2 LTS Apply cumulative security update 9.2.0.44 IBM MQ version 9.3 LTS Apply cumulative security update 9.3.0.42 IBM MQ version 9.4 LTS Apply cumulative security update 9.4.0.26 IBM MQ version 9.3 CD, 9.4 CD and 10.0.0.0 Upgrade to IBM MQ version 10.0.0.5

References

References1

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .