CVE-2026-56401: wazuh Null Dereference

Description

Wazuh wazuh-modulesd before 5.0.0-beta3 contains a null pointer dereference vulnerability in inventory_sync FlatBuffer DataValue handling. An enrolled agent can send a verifier-valid DataValue message omitting the optional id field, causing wazuh-modulesd to crash when dereferencing data->id()->string_view() without null validation, resulting in denial of service.

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CVSS v3.1 Score

6.5

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS — Exploit Prediction

0.0033

Probability of exploitation

0.25%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-476 CWE-476

Affected Products

Vendor	Product	Versions
wazuh	wazuh	< 5.0.0
wazuh	wazuh	All
wazuh	wazuh	All
wazuh	wazuh	All

References

Advisories & Patches

https://github.com/wazuh/wazuh/commit/3adf4f87942705aa0ceeba1e145c259cc9dcd242 https://github.com/wazuh/wazuh/security/advisories/GHSA-6hxp-c9x3-qc7p https://www.vulncheck.com/advisories/wazuh-null-pointer-dereference-in-inventory-sync-datavalue-flatbuffer-handling https://github.com/wazuh/wazuh/security/advisories/GHSA-6hxp-c9x3-qc7p

Exploits

https://github.com/wazuh/wazuh/security/advisories/GHSA-6hxp-c9x3-qc7p https://github.com/wazuh/wazuh/security/advisories/GHSA-6hxp-c9x3-qc7p

Frequently Asked Questions

What is CVE-2026-56401? +

Wazuh wazuh-modulesd before 5.0.0-beta3 contains a null pointer dereference vulnerability in inventory_sync FlatBuffer DataValue handling. An enrolled agent can send a verifier-valid DataValue message omitting the optional id field, causing wazuh-modulesd to crash when dereferencing data->id()->string_view() without null validation, resulting in denial of service. It has a CVSS v3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2026-56401? +

CVE-2026-56401 has a CVSS v3.1 score of 6.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0033, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-56401? +

CVE-2026-56401 affects products from wazuh, specifically: wazuh. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-56401? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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