Exploit for Deserialization of Untrusted Data in Wazuh CVE-2026-25769

## https://sploitus.com/exploit?id=038E56F8-016B-5F43-916F-6CF4FCC81FE3
# 🚨 CVE-2026-25769 - Wazuh Insecure Deserialization RCE



![Severity](https://img.shields.io/badge/Severity-Critical-red?style=for-the-badge)
![CVSS](https://img.shields.io/badge/CVSS-9.1-darkred?style=for-the-badge)
![CWE](https://img.shields.io/badge/CWE-502-orange?style=for-the-badge)
![Fixed](https://img.shields.io/badge/Fixed_in-4.14.3-success?style=for-the-badge)
![Mode](https://img.shields.io/badge/Affected-Cluster_Mode-blue?style=for-the-badge)

### **Critical Worker ➜ Master Remote Code Execution in Wazuh Cluster Mode**

> Unsafe deserialization in Wazuh cluster communications allows a compromised **worker node** to achieve **root RCE on the master node**.



---

## 📌 Overview

**CVE ID:** `CVE-2026-25769`
**Product:** `Wazuh`
**Affected Versions:** `4.0.0 → 4.14.2`
**Fixed Version:** `4.14.3`
**Severity:** `Critical`
**CVSS v3.1:** `9.1`
**CWE:** `CWE-502 — Deserialization of Untrusted Data`

A critical vulnerability in **Wazuh cluster mode** allows an attacker with access to a **worker node** to send malicious serialized payloads that are processed by the **master node**, resulting in **remote code execution with root privileges**. ([nvd.nist.gov](https://nvd.nist.gov/vuln/detail/CVE-2026-25769?utm_source=chatgpt.com))

---

## 🧠 Technical Summary

The vulnerability exists in the **master/worker synchronization workflow**.

When a worker node exchanges cluster data with the master, **untrusted serialized objects** may be deserialized without sufficient validation.

This enables a threat actor who already controls a worker to:

* inject malicious serialized payloads
* trigger arbitrary Python object reconstruction
* execute attacker-controlled code
* pivot into the **master manager**
* gain **root-level execution**

### 🔥 Attack Path

```text
Initial Access → Worker Node Compromise
                ↓
Malicious Cluster Sync Payload
                ↓
Unsafe Deserialization on Master
                ↓
Root Remote Code Execution
                ↓
Full SOC / SIEM Infrastructure Compromise
```

---

## 📷 Screenshot



---

## 🎯 Affected Scope

This CVE affects environments where:

* ✅ Wazuh is running in **cluster mode**
* ✅ version is between **4.0.0 and 4.14.2**
* ✅ at least one **worker node is compromised**
* ✅ worker ↔ master communication is allowed

### ⚠️ High-Risk Targets

Because the **master node centralizes**:

* detection rules
* agent keys
* integrations
* active responses
* cloud connectors
* threat intelligence feeds
* SOC dashboards

A successful exploit may lead to **complete SIEM takeover**. ([nvd.nist.gov](https://nvd.nist.gov/vuln/detail/CVE-2026-25769?utm_source=chatgpt.com))

---

## 🛡️ Mitigation

### ✅ Permanent Fix

Upgrade immediately:

```bash
Wazuh >= 4.14.3
```

The vendor confirms **4.14.3 patches the vulnerability**. ([nvd.nist.gov](https://nvd.nist.gov/vuln/detail/CVE-2026-25769?utm_source=chatgpt.com))

### 🚑 Temporary Hardening

Until patching is complete:

```bash
# Restrict cluster traffic
Allow only trusted worker IPs
Disable unused workers
Rotate cluster authentication secrets
Limit east-west lateral movement
Monitor cluster sync anomalies
```

Additional recommendations:

* isolate worker nodes into separate VLANs
* restrict SSH access
* rotate API keys
* verify custom integrations
* audit `/var/ossec/logs/`
* review root-owned file changes

---

## 🔍 Detection & Threat Hunting

### 📁 Log Artifacts

Focus on:

```text
/var/ossec/logs/ossec.log
/var/ossec/queue/cluster/
/var/ossec/framework/python/
```

### 🧪 Hunting Indicators

```yaml
- unusual worker sync bursts
- malformed serialized payload errors
- unexpected Python child processes
- shell execution from wazuh-manager
- new root-owned temp files
- worker-originated privilege escalation chain
```

### 🧩 Sigma-style Detection Logic

```yaml
title: Wazuh Cluster Unsafe Deserialization Attempt
id: CVE-2026-25769
status: experimental
logsource:
  product: linux
  service: wazuh-manager

detection:
  selection:
    process.parent.name: wazuh-manager
    process.name:
      - python3
      - sh
      - bash
  condition: selection

level: critical
```

---

## 📊 CVSS Vector

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

### 📖 Meaning

* **AV:N** → exploitable over network
* **AC:L** → low complexity
* **PR:H** → requires worker compromise first
* **S:C** → scope changes worker ➜ master
* **CIA:H** → total confidentiality, integrity, availability impact

---

## 🧱 Executive Risk Statement

> A single compromised worker can become a **launchpad to fully compromise the Wazuh master**, effectively giving an attacker control over the organization’s centralized detection and response stack.

This is especially dangerous for:

* MSSPs
* enterprise SOCs
* multi-tenant Wazuh clusters
* cloud SIEM deployments
* regulated environments

---

## 📚 References

* NVD Advisory — CVE-2026-25769 ([nvd.nist.gov](https://nvd.nist.gov/vuln/detail/CVE-2026-25769?utm_source=chatgpt.com))
* Wazuh Vendor Advisory (GHSA) ([github.com](https://github.com/wazuh/wazuh/security/advisories))
* Wazuh Releases / Patched Version ([github.com](https://github.com/wazuh/wazuh/releases))

---



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