What is CVE-2026-6730?

CVE-2026-6730 is a critical-severity vulnerability in IBM Concert, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2026-09-23.

How severe is CVE-2026-6730?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in IBM Concert

CVE-2026-6730

IBM Concert 1.0.0 through 3.0.0 is vulnerable to a buffer overflow, caused by improper bounds checking. A local user could overflow the buffer and execute arbitrary code on the system.

Vulnerability class: Buffer Overflow

Published 2026-09-23.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

IBM Concert

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

www.ibm.com/support/pages/node/7288830 (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-6730?: CVE-2026-6730 is a critical-severity vulnerability in IBM Concert, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2026-09-23.
How severe is CVE-2026-6730?: Critical severity. CVSS v3 base score is 9.8 out of 10.