Affects IBM DataPower Gateway, a widely deployed enterprise API/integration gateway; remote info disclosure and DoS can disrupt business integrations and services.
CVE-2026-16159
Out-of-bounds write in IBM DataPower Gateway allows info leak and DoS.
Is CVE-2026-16159 being exploited?
Not confirmed. CVE-2026-16159 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.27% probability of exploitation in the next 30 days.
How severe is CVE-2026-16159?
CVE-2026-16159 is rated High with a CVSS score of 8.6. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-16159?
Yes. A fix has been recorded for CVE-2026-16159. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-16159 affect?
CVE-2026-16159 affects IBM DataPower Gateway 10.5.0.0-10.5.0.22, IBM DataPower Gateway 10.6.0.0-10.6.0.10, IBM DataPower Gateway 10.6.1-10.6.6, IBM DataPower Gateway 11.0.0.0-11.0.0.2. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-16159?
Apply IBM security updates immediately and restrict/monitor network access to DataPower.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote attacker can trigger an out-of-bounds write to exfiltrate sensitive data and cause denial of service against DataPower appliances.
Immediate action required
- affected>= 10.5.0.0 and <= 10.5.0.22
- affected>= 10.6.0.0 and <= 10.6.0.10
- affected>= 10.6.1 and <= 10.6.6
- affected>= 11.0.0.0 and <= 11.0.0.2
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.