Remote code execution in IBM i (enterprise OS) across multiple supported releases; exploitable RCE on widely deployed systems could disrupt enterprise operations.
CVE-2026-17206
Remote code execution via buffer overflow in IBM i 7.3–7.6
Is CVE-2026-17206 being exploited?
Not confirmed. CVE-2026-17206 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 0.39% probability of exploitation in the next 30 days.
How severe is CVE-2026-17206?
CVE-2026-17206 is rated High with a CVSS score of 8.1. 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-2026-17206?
Yes. A fix has been recorded for CVE-2026-17206. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-17206 affect?
CVE-2026-17206 affects IBM i 7.3, IBM i 7.4, IBM i 7.5, IBM i 7.6. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-17206?
Identify IBM i hosts, restrict network exposure and apply vendor patches when released
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote attackers can execute arbitrary code via buffer overflow, enabling full system compromise, data access, and persistence on affected IBM i systems.
Immediate action required
- affected7.6
- affected7.5
- affected7.4
- affected7.3
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.