CVE-2026-78543 IBM App Connect Enterprise and IBM Integration Bus for z/OS Adapter nodes are vulnerable to multiple CVEs

What is CVE-2026-78543?

CVE-2026-78543 is a medium-severity denial of service vulnerability in IBM App Connect Enterprise, published on 4 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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 could allow a remote attacker to cause a denial of service due to an infinite loop.

Weakness: CWE-835

Which versions are affected by CVE-2026-78543?

It affects 2 products.

Products include Ibm App Connect Enterprise, Ibm Integration Bus for Z\/Os.

How do I fix CVE-2026-78543?

No fix has been published for CVE-2026-78543 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-78543 being exploited?

There is no known exploitation of CVE-2026-78543 in the wild and no public exploit code.

Other vulnerabilities in IBM App Connect Enterprise

• CVE-2026-15435 IBM App Connect Enterprise is vulnerable to arbitrary file write vulnerability Critical 9.8
• CVE-2024-22317 IBM App Connect Enterprise denial of service Critical 9.1
• CVE-2026-75624 IBM App Connect Enterprise is vulnerable to privilege escalation and Denial of Service High 8.8
• CVE-2026-14522 IBM App Connect Enterprise is vulnerable to an arbitrary file read and arbitrary changes to configuration settings High 8.8
• CVE-2026-81832 IBM App Connect Enterprise and IBM Integration Bus for z/OS Adapter nodes are vulnerable to multiple CVEs High 7.7

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-3x6q-qhf5-8m4j.