CVE-2026-6928: IBM Concert 1.0.0 through 3.0.0 references or accesses memory after it has been freed

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CRITICAL 9.8REMOTEUPGRADE

CVE-2026-6928 is a critical-severity flaw (CVSS 9.8) affecting concert. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

IBM Concert 1.0.0 through 3.0.0 references or accesses memory after it has been freed. This allows an attacker who can influence program execution or input may exploit this condition to corrupt memory, cause application crashes, or execute arbitrary code.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 60%)
CISA exploited list	No
Weakness	CWE-416
Published	2026-09-23
Last modified	2026-09-29

Publisher (CNA): IBM Corporation · Vendor: ibm

Last updated 2026-09-29 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-23 21:17 UTCPublished CVE record published
2026-09-29 14:08 UTCUpdated Record last modified

ibm concert UPGRADE

Affected: >= 1.0.0 and <= 3.0.0

Fixed in: newer than 3.0.0

Safe to downgrade to: a release before 1.0.0

1. Check installed version

apt-cache policy concert || rpm -q concert || concert --version

2. UPGRADE to newer than 3.0.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade concert

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade concert

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 1.0.0 (Debian / Ubuntu)

apt-cache madison concert sudo apt install concert=<VERSION_BEFORE_1.0.0> sudo apt-mark hold concert

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list concert sudo dnf downgrade concert-<VERSION_BEFORE_1.0.0> sudo dnf versionlock add concert

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-6928?

concert: upgrade to newer than 3.0.0. Exact commands for each OS are on this page.

Is CVE-2026-6928 being exploited?

CVE-2026-6928 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-6928 affect?

CVE-2026-6928 affects concert. Severity is critical (CVSS 9.8). IBM Concert 1.0.0 through 3.0.0 references or accesses memory after it has been freed. This allows an attacker who can influence program execution or input may exploit this condition to corrupt memory, cause application crashes, or execute

How urgent is CVE-2026-6928?

Priority 49/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-6935 HIGH 7.8 UPGRADE IBM Concert 1.0.0 through 3.0.0 invokes operating system commands without fully qualifying executable paths or
CVE-2026-6544 MEDIUM 6.2 UPGRADE IBM Concert 1.0.0 through 3.0.0 allows recursive copying of directories without proper controls which can lead
CVE-2026-6925 MEDIUM 5.3 UPGRADE IBM Concert 1.0.0 through 3.0.0 could allow a remote attacker to traverse directories on the system
CVE-2026-6794 HIGH 7.8 UPGRADE IBM Concert 1.0.0 through 3.0.0 has a double free vulnerability that exists due to incorrect memory management
CVE-2026-6730 CRITICAL 9.8 UPGRADE IBM Concert 1.0.0 through 3.0.0 is vulnerable to a buffer overflow, caused by improper bounds checking

References

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