CVE-2026-6928 is a use-after-free flaw in IBM Concert versions 1.0.0 through 3.0.0 that an attacker could use to corrupt memory, crash the application, or run arbitrary code.
What Is It
CVE-2026-6928 is a memory-safety bug in IBM Concert, classified as CWE-416 (Use After Free). IBM says the product "references or accesses memory after it has been freed." An attacker who can influence program execution or input may be able to use this to corrupt memory, crash the application, or execute arbitrary code.
IBM's PSIRT reported the issue, and NVD published it on 2026-09-23. The NVD record's status is currently "Received," which means NVD has not yet done its own analysis.
Why It Matters
IBM rates the flaw 9.8 (Critical) under CVSS 3.1, with the vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. The vector shows:
- Attack vector: Network. The flaw can be reached remotely.
- Attack complexity: Low.
- Privileges required: None.
- User interaction: None.
- Impact: High for confidentiality, integrity, and availability.
Taken together, the score describes a flaw that could be exploited remotely without logging in, with full compromise of the affected application as a possible outcome. The exploitability subscore is 3.9 and the impact subscore is 5.9.
Exploitation status: No CISA Known Exploited Vulnerabilities (KEV) entry was provided for this CVE. The supplied data does not confirm active exploitation, and CISA has not set a required action or due date.
What's Vulnerable
- Vendor: IBM
- Product: Concert
- Affected versions: 1.0.0 through 3.0.0, inclusive
Any Concert deployment running a version in this range should be treated as affected.
Patch Status
The supplied NVD record does not name a fixed version or give specific remediation steps. IBM's security bulletin, linked in the record, is the official source for fix and mitigation guidance. Administrators should:
- Check the IBM bulletin for fixed releases or workarounds.
- Find all Concert instances running versions 1.0.0 through 3.0.0.
- Put patching first for instances that can be reached over the network, given the critical rating.
This entry should be updated if CISA adds the CVE to KEV or NVD finishes its analysis.