# CVE-2026-6730: IBM Concert buffer overflow in local bounds checking

Source: https://junglewise.ai/threats/cve-2026-6730-ibm-concert-1-0-0-through-3-0-0-is-vulnerable-to-a-buffer-overflow  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-23. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-6730 · Severity: critical · CVSS 9.8 · Published 2026-09-23

IBM Concert is software used for enterprise application integration and workflow automation. A buffer overflow vulnerability in versions 1.0.0 through 3.0.0 allows a local user to execute arbitrary code on the system due to improper bounds checking, potentially giving an attacker full system control.

Technologies: [IBM Concert](https://junglewise.ai/threats/technologies/concert). Vendors: [IBM](https://junglewise.ai/threats/vendors/ibm).

## Quick answers

**Is CVE-2026-6730 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-6730 being exploited in the wild.

**How severe is CVE-2026-6730?** Critical severity, with a CVSS score of 9.8, published 23 September 2026.

**Which products and versions are affected?** IBM Concert 1.0.0 through 3.0.0.

**Is there a fix for CVE-2026-6730?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-6730 attacked?** It is attacked with local access, in a hosted service.

**Am I affected by CVE-2026-6730?** Check whether you run IBM Concert at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A buffer overflow exists in IBM Concert caused by improper bounds checking. The vulnerability is exploitable by a local user to execute arbitrary code on the affected system. The attack requires local access and no authentication bypass is mentioned, indicating the attacker must already have user-level access to the system.

## Affected products

- IBM Concert 1.0.0 through 3.0.0

## Timeline

- 2026-09-23: disclosed

## References

- [https://www.ibm.com/support/pages/node/7288830](https://www.ibm.com/support/pages/node/7288830)

## Related threats

- [IBM Concert command injection vulnerability](https://junglewise.ai/threats/cve-2026-6715-ibm-concert-1-0-through-3-0-1-1-allows-an-attacker-can-supply)
- [IBM Concert arbitrary command execution in dependencies](https://junglewise.ai/threats/cve-2026-15266-ibm-concert-1-0-through-3-0-1-1-contains-components-that-allow)
- [IBM Concert weak cryptographic algorithms allow decryption](https://junglewise.ai/threats/cve-2026-6719-ibm-concert-1-0-through-3-0-0-uses-weaker-than-expected)
- [IBM Concert cross-site scripting in Web UI](https://junglewise.ai/threats/cve-2026-4413-ibm-concert-1-0-through-3-0-0-is-vulnerable-to-cross-site)
- [IBM Concert local web cache accessible to other users](https://junglewise.ai/threats/cve-2026-4405-ibm-concert-1-0-through-3-0-0-allows-web-page-cache-to-be-stored)