CVE-2026-6730

Local code execution via stack buffer overflow

Published Sep 23, 2026 · Updated Sep 23, 2026

Stack-based buffer overflow in IBM Concert 1.0.0 through 3.0.0 allows local users to execute arbitrary code via crafted input. IBM has disclosed only that improper bounds checking lets attacker-controlled data overrun a stack buffer; it has not identified the affected component or operation. A local account is required, and successful exploitation runs code on the Concert host in the vulnerable process's security context.

CVSS severityUnavailable
Unscored
EPSS probability0.30%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in IBM Concert 1.0.0 through 3.0.0 allows local users to execute arbitrary code via crafted input. IBM has disclosed only that improper bounds checking lets attacker-controlled data overrun a stack buffer; it has not identified the affected component or operation. A local account is required, and successful exploitation runs code on the Concert host in the vulnerable process's security context.

The record

CVE
CVE-2026-6730
Published
Sep 23, 2026
Updated
Sep 23, 2026
Vendor
IBM
Product
Concert
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.0.0 <=3.0.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

IBM · Concertversion=1.0.0 <=3.0.0

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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