CVE-2026-44251: Wazuh is a free and open source platform used for threat prevention, detection, and response

Routine

MEDIUM 6.5UPGRADE

CVE-2026-44251 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 is a free and open source platform used for threat prevention, detection, and response. In versions 3.0.0 and above, prior to 4.14.5, a size_t integer underflow in os_crypto/shared/msgs.c:389 allows any enrolled Wazuh agent to crash the wazuh-remoted process on the manager, immediately disconnecting all agents from the manager. A second code path reached by the same underflow may allow heap memory corruption. This issue has been fixed in ve

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	0.4% (top 62%)
CISA exploited list	No
Weakness	CWE-122, CWE-191
Published	2026-07-17
Last modified	2026-07-20

Publisher (CNA): GitHub, Inc. · Vendor: wazuh

Last updated 2026-07-20 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-17 02:18 UTCPublished CVE record published
2026-07-20 02:22 UTCUpdated Record last modified

wazuh wazuh UPGRADE

Affected: >= 3.0.0 and < 4.14.5

Fixed in: 4.14.5

Safe to downgrade to: a release before 3.0.0

1. Check installed version

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

2. UPGRADE to 4.14.5 (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 3.0.0 (Debian / Ubuntu)

apt-cache madison wazuh sudo apt install wazuh=<VERSION_BEFORE_3.0.0> 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_3.0.0> 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.

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-2026-44251?

wazuh: upgrade to 4.14.5. Exact commands for each OS are on this page.

Is CVE-2026-44251 being exploited?

CVE-2026-44251 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-2026-44251 affect?

CVE-2026-44251 affects wazuh. Severity is medium (CVSS 6.5). Wazuh is a free and open source platform used for threat prevention, detection, and response. In versions 3.0.0 and above, prior to 4.14.5, a size_t integer underflow in os_crypto/shared/msgs.c:389 allows any enrolled Wazuh agent to crash t

How urgent is CVE-2026-44251?

Priority 37/100. Public exploit reference

Software pages

Wazuh vulnerabilities

Related CVEs

CVE-2026-44252 HIGH 8.8 UPGRADE Wazuh is a free and open source platform used for threat prevention, detection, and response
CVE-2026-46343 HIGH 7.2 UPGRADE Wazuh is a free and open source platform used for threat prevention, detection, and response
CVE-2026-44253 MEDIUM 4.9 UPGRADE Wazuh is a free and open source platform used for threat prevention, detection, and response
CVE-2026-44254 MEDIUM 5.3 UPGRADE Wazuh is a free and open source platform used for threat prevention, detection, and response
CVE-2026-32983 MEDIUM 5.8 UPGRADE Wazuh Manager authd service in wazuh-manager packages through version 4.7.3 contains an improper restriction o

References

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