CVE-2026-74039: Wazuh 4.0.0 before 4.14.7 and 5.0.0-beta2 contain a denial of service vulnerability that allows authenticated

Routine

MEDIUM 6.5UPGRADE

CVE-2026-74039 is a medium-severity flaw (CVSS 6.5) affecting wazuh. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Wazuh 4.0.0 before 4.14.7 and 5.0.0-beta2 contain a denial of service vulnerability that allows authenticated attackers with allow_run_as enabled to exhaust CPU resources by submitting arbitrarily deeply nested JSON structures to the POST /security/user/authenticate/run_as endpoint. Attackers can repeatedly submit malformed auth_context bodies with unlimited nesting depth to cause the API framework to consume excessive CPU, denying service to all

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.6% (top 54%)
CISA exploited list	No
Weakness	CWE-770, CWE-1333
Published	2026-08-18
Last modified	2026-10-22

Publisher (CNA): VulnCheck · Vendor: wazuh

Am I affected?

Timeline

2026-08-18Published CVE record published
2026-10-22 22:10 UTCUpdated Record last modified

wazuh wazuh UPGRADE

Affected: >= 4.0.0 and < 4.14.7 · 5.0.0 beta1 · 5.0.0 beta2

Fixed in: 4.14.7

Safe to downgrade to: a release before 4.0.0

1. Check installed version

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

2. UPGRADE to 4.14.7 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade wazuh

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 4.0.0 (Debian / Ubuntu)

apt-cache madison wazuh sudo apt install wazuh=<VERSION_BEFORE_4.0.0> sudo apt-mark hold wazuh

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

dnf --showduplicates list wazuh sudo dnf downgrade wazuh-<VERSION_BEFORE_4.0.0> sudo dnf versionlock add wazuh

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.

Exact fixes by distribution

Fedora 46 · retext · FIXED · 8.1.0-1.fc46 · FEDORA-2026-0602a84203 · source

sudo dnf upgrade --advisory=FEDORA-2026-0602a84203

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Write-up: github.com/wazuh/wazuh/security/advisories/GHSA-5vh8-34r8-q74q

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.

Related CVEs

CVE-2026-74038 HIGH 7.1 UPGRADE Wazuh 4.0.0 before 4.14.6 contains a path traversal vulnerability that allows unauthenticated remote attackers
CVE-2026-74044 MEDIUM 6.5 UPGRADE Wazuh 4.0.0 before 4.14.6 contains a path traversal vulnerability that allows authenticated cluster peers to d
CVE-2026-74046 MEDIUM 4.9 UPGRADE Wazuh 4.4.0 before 4.14.7 contains a denial of service vulnerability in the fdecompress_files() function withi

References

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