CVE-2026-16180Network attack vector

Toolkit denial of service via XML entity expansion

Published Sep 4, 2026 · Updated Sep 4, 2026

XML entity expansion in IBM App Connect Enterprise Toolkit allows remote authenticated users to crash it through crafted XML. The Toolkit fails to restrict recursive entity references in a DTD, allowing expansion to consume resources until service is interrupted. Exploitation requires authenticated access and user interaction; affected releases span App Connect Enterprise 12.x and 13.x and Integration Bus for z/OS 10.1.

CVSS severity5.7
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

XML entity expansion in IBM App Connect Enterprise Toolkit allows remote authenticated users to crash it through crafted XML. The Toolkit fails to restrict recursive entity references in a DTD, allowing expansion to consume resources until service is interrupted. Exploitation requires authenticated access and user interaction; affected releases span App Connect Enterprise 12.x and 13.x and Integration Bus for z/OS 10.1.

The record

CVE
CVE-2026-16180
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
OpenBMC Project
Product
Integration Bus for z/OS
Classifications
CWE-776, CAPEC-197
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.1.0.0 <=10.1.0.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

OpenBMC Project · Integration Bus for z/OSversion=10.1.0.0 <=10.1.0.7
IBM · App Connect Enterpriseversion=12.0.1.0 <=12.0.12.28; version=13.0.1.0 <=13.0.8.1

Published CVSS scores

5.7IBMCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-776Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')
CAPEC-197Exponential Data Expansion

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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