CVE-2023-29596: Buffer Overflow vulnerability found in ByronKnoll Cmix v.19 allows an attacker to execute arbitrary code and c

Routine

HIGH 7.8DOWNGRADE

CVE-2023-29596 is a high-severity flaw (CVSS 7.8) affecting cmix. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer Overflow vulnerability found in ByronKnoll Cmix v.19 allows an attacker to execute arbitrary code and cause a denial of service via the paq8 function.

Why this priority

High severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 74%)
CISA exploited list	No
Weakness	CWE-120
Published	2023-04-26
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: cmix project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-04-26 20:15 UTCPublished CVE record published
2026-06-17 05:50 UTCUpdated Record last modified

cmix project cmix DOWNGRADE

Affected: 19

Fixed in: no fixed release known

Safe to downgrade to: a release before 19

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 19 (Debian / Ubuntu)

apt-cache madison cmix sudo apt install cmix=<VERSION_BEFORE_19> sudo apt-mark hold cmix

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list cmix sudo dnf downgrade cmix-<VERSION_BEFORE_19> sudo dnf versionlock add cmix

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-2023-29596?

cmix: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-29596 being exploited?

CVE-2023-29596 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-2023-29596 affect?

CVE-2023-29596 affects cmix. Severity is high (CVSS 7.8). Buffer Overflow vulnerability found in ByronKnoll Cmix v.19 allows an attacker to execute arbitrary code and cause a denial of service via the paq8 function.

How urgent is CVE-2023-29596?

Priority 39/100. High severity; Public exploit reference

References

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