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CVE-2026-12538VulnerabilityPublished

IBM MQ 9.4.0.0 to 9.4.0.26, 9.4.1.0 to 9.4.5.3, and 10.0.0.1 to 10.0.0.5 could allow an authenticated attacker to

Source GCVE Database

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Authoritative record:CVE-2026-12538· Medium 5.4

Not known to be exploited · CVSS 5.4 Medium.

Data as of 4 Nov 2026, 22:37 UTC

CVSS 3.1 base score
5.4Medium
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (ibm)CVSS 3.15.4
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 4 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 4 Nov 2026.

What to do

Affected software

ProductAffectedFixed in
IBMMQ ApplianceAffected
  • >=9.4.0.0 <=9.4.0.26
  • >=9.4.1.0 <=9.4.5.3
  • >=10.0.0.1 <=10.0.0.5
Fixed in–

AI-suggested

Until a fix is available, organizations should restrict authenticated access to IBM MQ instances to trusted users only and monitor for unusual activity related to message header processing.

Description

IBM MQ versions 9.4.0.0 through 9.4.0.26, 9.4.1.0 through 9.4.5.3, and 10.0.0.1 through 10.0.0.5 contain a vulnerability where improper validation of message header structure length fields could allow an authenticated attacker to obtain sensitive information or cause a denial of service.

References

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