CVE-2026-78543: 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

Routine

MEDIUM 5.3REMOTEUPGRADEUPGRADE

CVE-2026-78543 is a medium-severity flaw (CVSS 5.3) affecting app connect enterprise, integration bus for z\/os. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 54%)
CISA exploited list	No
Weakness	CWE-835
Published	2026-09-04
Last modified	2026-09-09

Publisher (CNA): IBM Corporation · Vendor: ibm

Last updated 2026-09-09 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-04 16:17 UTCPublished CVE record published
2026-09-09 14:50 UTCUpdated Record last modified

ibm app connect enterprise UPGRADE

Affected: >= 12.0.1.0 and < 12.0.12.29 · >= 13.0.1.0 and < 13.0.8.2

Fixed in: 12.0.12.29, 13.0.8.2

Safe to downgrade to: a release before 12.0.1.0

1. Check installed version

apt-cache policy app-connect-enterprise || rpm -q app-connect-enterprise || app-connect-enterprise --version

2. UPGRADE to 12.0.12.29 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade app-connect-enterprise

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade app-connect-enterprise

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 12.0.1.0 (Debian / Ubuntu)

apt-cache madison app-connect-enterprise sudo apt install app-connect-enterprise=<VERSION_BEFORE_12.0.1.0> sudo apt-mark hold app-connect-enterprise

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list app-connect-enterprise sudo dnf downgrade app-connect-enterprise-<VERSION_BEFORE_12.0.1.0> sudo dnf versionlock add app-connect-enterprise

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

ibm integration bus for z\/os UPGRADE

Affected: >= 10.1.0.0 and <= 10.1.0.7

Fixed in: newer than 10.1.0.7

Safe to downgrade to: a release before 10.1.0.0

1. Check installed version

apt-cache policy integration-bus-for-zos || rpm -q integration-bus-for-zos || integration-bus-for-zos --version

2. UPGRADE to newer than 10.1.0.7 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade integration-bus-for-zos

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade integration-bus-for-zos

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 10.1.0.0 (Debian / Ubuntu)

apt-cache madison integration-bus-for-zos sudo apt install integration-bus-for-zos=<VERSION_BEFORE_10.1.0.0> sudo apt-mark hold integration-bus-for-zos

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list integration-bus-for-zos sudo dnf downgrade integration-bus-for-zos-<VERSION_BEFORE_10.1.0.0> sudo dnf versionlock add integration-bus-for-zos

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-78543?

app connect enterprise: upgrade to 12.0.12.29, 13.0.8.2; integration bus for z\/os: upgrade to newer than 10.1.0.7. Exact commands for each OS are on this page.

Is CVE-2026-78543 being exploited?

CVE-2026-78543 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-78543 affect?

CVE-2026-78543 affects app connect enterprise, integration bus for z\/os. Severity is medium (CVSS 5.3). 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.

How urgent is CVE-2026-78543?

Priority 35/100. Remotely exploitable, no login, no user action

Related CVEs

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References

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