Critical remote code execution (use-after-free) in an IBM enterprise product; can enable full system takeover across deployments and merits broad org-wide notification.
CVE-2026-6928
Use-after-free in IBM Concert allows remote code execution.
Is CVE-2026-6928 being exploited?
Not confirmed. CVE-2026-6928 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 0.45% probability of exploitation in the next 30 days.
How severe is CVE-2026-6928?
CVE-2026-6928 is rated Critical with a CVSS score of 9.8. 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-2026-6928?
Not known from our data. No patch reference has been recorded for CVE-2026-6928, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-6928 affect?
CVE-2026-6928 affects IBM Concert 1.0.0 - 3.0.0. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-6928?
Apply vendor update immediately; isolate systems and restrict access until patched.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote arbitrary code execution via use-after-free leading to crashes, memory corruption, or full system takeover.
Immediate action required
- affected>= 1.0.0 and <= 3.0.0
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.