EUVD-2026-71490
GHSA-gv9r-vxw2-5527
Severity by source
AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
Network-reachable DoS requires authenticated low-privilege user and user interaction; no confidentiality or integrity impact from entity expansion.
Primary rating from Vendor (ibm).
CVSS VectorVendor: ibm
Lifecycle Timeline
2DescriptionCVE.org
IBM App Connect Enterprise 13.0.1.0 through 13.0.8.1, and 12.0.1.0 through 12.0.12.28 and IBM Integration Bus for z/OS 10.1.0.0 through 10.1.0.7 Toolkit could allow an authenticated user to cause a denial-of-service condition due to improper validation of XML entities.
AnalysisAI
Denial-of-service exposure in IBM App Connect Enterprise and IBM Integration Bus for z/OS Toolkit allows an authenticated, network-connected user to crash or incapacitate the Toolkit by submitting crafted XML containing recursive or deeply nested entity references. The root cause is CWE-776, improper restriction of recursive entity references in DTDs - commonly called an XML Entity Expansion or 'Billion Laughs' attack. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated user with at least low-level access to the IBM App Connect Enterprise Toolkit or IBM Integration Bus for z/OS Toolkit (PR:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 5.7 (Medium) reflects a constrained threat model: exploitation requires PR:L (authenticated user) and UI:R (some user interaction, such as opening or processing a crafted message/project file in the Toolkit). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch is available per IBM Security Bulletin 7286372 (https://www.ibm.com/support/pages/node/7286372); consult that advisory for the exact fix versions applicable to your ACE and IIB z/OS release streams. … Detailed patch versions, workarounds, and compensating controls in full report. |
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