CVE-2026-81210: IBM DataStage on Cloud Pak for Data 5.4.0.0 concatenates three caller-supplied strings into a String.format pa

Routine

HIGH 7.7DOWNGRADE

CVE-2026-81210 is a high-severity flaw (CVSS 7.7) affecting datastage on cloud pak for data. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

IBM DataStage on Cloud Pak for Data 5.4.0.0 concatenates three caller-supplied strings into a String.format path on the shared /ds-storage RWX PVC and returns the file with no project ACL — pure IDOR plus traversal. Read is constrained to files named job.log/error.log, but DataStage job logs routinely carry connection strings, {dsnextenc} ciphertexts (decryptable via d2-f023), and customer-data row samples. This is the operator's tenant-to-tenant

Why this priority

High severity

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.7 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 73%)
CISA exploited list	No
Weakness	CWE-639
Published	2026-09-10
Last modified	2026-09-16

Publisher (CNA): IBM Corporation · Vendor: ibm

Last updated 2026-09-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-10 22:17 UTCPublished CVE record published
2026-09-16 00:46 UTCUpdated Record last modified

ibm datastage on cloud pak for data DOWNGRADE

Affected: 5.4.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.4.0

1. Check installed version

apt-cache policy datastage-on-cloud-pak-for-data || rpm -q datastage-on-cloud-pak-for-data || datastage-on-cloud-pak-for-data --version

2. No fixed release: DOWNGRADE to a release before 5.4.0 (Debian / Ubuntu)

apt-cache madison datastage-on-cloud-pak-for-data sudo apt install datastage-on-cloud-pak-for-data=<VERSION_BEFORE_5.4.0> sudo apt-mark hold datastage-on-cloud-pak-for-data

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list datastage-on-cloud-pak-for-data sudo dnf downgrade datastage-on-cloud-pak-for-data-<VERSION_BEFORE_5.4.0> sudo dnf versionlock add datastage-on-cloud-pak-for-data

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-2026-81210?

datastage on cloud pak for data: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-81210 being exploited?

CVE-2026-81210 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-2026-81210 affect?

CVE-2026-81210 affects datastage on cloud pak for data. Severity is high (CVSS 7.7). IBM DataStage on Cloud Pak for Data 5.4.0.0 concatenates three caller-supplied strings into a String.format path on the shared /ds-storage RWX PVC and returns the file with no project ACL — pure IDOR plus traversal. Read is constrained to f

How urgent is CVE-2026-81210?

Priority 34/100. High severity

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References

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