CVE-2026-23919: For performance reasons Zabbix Server/Proxy reuses JavaScript (Duktape) contexts (used in script items, JavaSc

Routine

MEDIUM 6.0UPGRADE

CVE-2026-23919 is a medium-severity flaw (CVSS 6.0) affecting zabbix. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

For performance reasons Zabbix Server/Proxy reuses JavaScript (Duktape) contexts (used in script items, JavaScript reprocessing, Webhooks). This can lead to confidentiality loss where a regular (non-super) Zabbix administrator leaks data for hosts they do not have access to. A fix has been released that makes the built in Zabbix JavaScript objects read-only, but please be advised that usage of global JavaScript variables is not recommended becaus

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.0 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.3% (top 83%)
CISA exploited list	No
Weakness	CWE-488
Published	2026-03-24
Last modified	2026-09-18

Publisher (CNA): Zabbix · Vendor: zabbix

Last updated 2026-09-18 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-24 19:16 UTCPublished CVE record published
2026-09-18 17:07 UTCUpdated Record last modified

zabbix zabbix UPGRADE

Affected: >= 6.0.0 and < 6.0.42 · >= 7.0.0 and < 7.0.19 · >= 7.2.0 and < 7.2.13 · >= 7.4.0 and < 7.4.3

Fixed in: 6.0.42, 7.0.19, 7.2.13, 7.4.3

Safe to downgrade to: a release before 6.0.0

1. Check installed version

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

2. UPGRADE to 6.0.42 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade zabbix

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 6.0.0 (Debian / Ubuntu)

apt-cache madison zabbix sudo apt install zabbix=<VERSION_BEFORE_6.0.0> sudo apt-mark hold zabbix

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

dnf --showduplicates list zabbix sudo dnf downgrade zabbix-<VERSION_BEFORE_6.0.0> sudo dnf versionlock add zabbix

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-2026-23919?

zabbix: upgrade to 6.0.42, 7.0.19, 7.2.13, 7.4.3. Exact commands for each OS are on this page.

Is CVE-2026-23919 being exploited?

CVE-2026-23919 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-2026-23919 affect?

CVE-2026-23919 affects zabbix. Severity is medium (CVSS 6.0). For performance reasons Zabbix Server/Proxy reuses JavaScript (Duktape) contexts (used in script items, JavaScript reprocessing, Webhooks). This can lead to confidentiality loss where a regular (non-super) Zabbix administrator leaks data fo

How urgent is CVE-2026-23919?

Priority 25/100. No elevated risk signals yet.

Software pages

Zabbix vulnerabilities

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References

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