---
id: CVE-2026-62365
title: >-
  Wazuh: Heap Buffer Overflow in DecodeWinevt() join_data Accumulation via
  Crafted EventChannel XML
summary: >-
  Wazuh is an open-source security platform providing unified XDR and SIEM
  protection for endpoints and cloud workloads. DecodeWinevt in
  src/analysisd/decoders/winevtchannel.c accumulates unnamed Windows
  EventChannel Data element contents …
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-122
vendor: wazuh
product: wazuh
affected:
  - 'wazuh >= 3.9.0, < 4.14.7'
published: '2026-11-04'
updated: '2026-11-04'
sourceUpdated: '2026-11-04T22:46:40.298Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-62365'
references:
  - url: 'https://github.com/wazuh/wazuh/security/advisories/GHSA-whhr-gxxr-f6pm'
    label: 'https://github.com/wazuh/wazuh/security/advisories/GHSA-whhr-gxxr-f6pm'
  - url: 'https://github.com/wazuh/wazuh/pull/37198'
    label: 'https://github.com/wazuh/wazuh/pull/37198'
  - url: >-
      https://github.com/wazuh/wazuh/commit/07c5b2829f671eac0436412701a346a26555fdc7
    label: >-
      https://github.com/wazuh/wazuh/commit/07c5b2829f671eac0436412701a346a26555fdc7
  - url: 'https://github.com/wazuh/wazuh/releases/tag/v4.14.7'
    label: 'https://github.com/wazuh/wazuh/releases/tag/v4.14.7'
tags:
  - cve.org
ingestedAt: '2026-11-05T21:36:00.663Z'
epss: 0.00284
epssPercentile: 0.21033
---

## Overview

Wazuh is an open-source security platform providing unified XDR and SIEM protection for endpoints and cloud workloads. DecodeWinevt in src/analysisd/decoders/winevtchannel.c accumulates unnamed Windows EventChannel Data element contents into the fixed 65,535-byte join_data heap buffer but passes the growing content length, rather than the OS_MAXSTR buffer capacity, as the snprintf size. An enrolled agent can submit an EventChannel message containing four maximum-sized unnamed Data elements, causing the fourth accumulation to write beyond join_data and corrupt adjacent heap metadata. The subsequent free of join_data2 causes the wazuh-analysisd process to terminate, stopping log ingestion for all agents handled by that manager. This vulnerability is fixed in 4.14.7.

## Affected

- `wazuh >= 3.9.0, < 4.14.7`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.