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🔎 Overview

CVE-2026-63292 is a stack-based buffer overflow vulnerability affecting the Apache HTTP Server mod_vhost_alias module.

The issue can be triggered under specific server configurations involving oversized HTTP Host headers and VirtualDocumentRoot hostname format specifiers.

Vulnerability

CVE-2026-63292
├── Component: mod_vhost_alias
├── Type: Stack-Based Buffer Overflow
├── CWE: CWE-121
├── Attack Vector: Network
├── Authentication: Not required
└── Impact: Denial of Service / Potential Code Execution

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🎯 Affected Versions

Apache HTTP Server	Status
2.4.0 – 2.4.68	⚠️ Affected
2.4.69+	✅ Fixed

Always verify the package version supplied by your operating-system vendor, as distributions may backport security fixes without changing the upstream version number.

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⚙️ Affected Component

Apache HTTP Server
        │
        ▼
   mod_vhost_alias
        │
        ▼
VirtualDocumentRoot
        │
        ▼
Hostname format processing
        │
        ▼
Oversized Host header
        │
        ▼
Stack-based buffer overflow

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🧪 Configuration Requirements

The vulnerability is associated with a specific configuration combination.

Relevant indicators include:

LoadModule vhost_alias_module modules/mod_vhost_alias.so

VirtualDocumentRoot /var/www/%0

LimitRequestFieldSize <value above default>

A vulnerable configuration should be evaluated only in an authorized test environment.

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🔬 Safe Detection

Check the Apache version:

apache2 -v

Debian / Ubuntu:

dpkg -l | grep apache2

RHEL / Fedora:

rpm -qa | grep httpd

Check whether mod_vhost_alias is loaded:

apachectl -M | grep vhost

or:

apache2ctl -M | grep vhost

Search the configuration:

grep -R "VirtualDocumentRoot" /etc/apache2/ 2>/dev/null

Check LimitRequestFieldSize:

grep -R "LimitRequestFieldSize" /etc/apache2/ 2>/dev/null

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🛡️ Recommended Mitigation

Upgrade Apache HTTP Server to a version containing the security fix.

Affected
2.4.0 ───────────────► 2.4.68
                         │
                         │ UPDATE
                         ▼
                     2.4.69+
                      FIXED

After updating, verify:

apache2 -v

Then validate the configuration:

apachectl configtest

Restart the service if appropriate for your environment:

sudo systemctl restart apache2

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🚫 Non-Exploit Verification

This repository intentionally focuses on safe vulnerability identification.

It does not provide:

• Weaponized exploit code
• Remote code execution payloads
• Memory corruption payloads
• Shellcode
• Destructive denial-of-service testing

The recommended approach is version and configuration verification.

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🧰 Security Research Workflow

     ┌──────────────────────┐
     │ Identify Apache      │
     │ version              │
     └──────────┬───────────┘
                │
                ▼
     ┌──────────────────────┐
     │ Check mod_vhost_alias │
     └──────────┬───────────┘
                │
                ▼
     ┌──────────────────────┐
     │ Review VirtualHost / │
     │ VirtualDocumentRoot  │
     └──────────┬───────────┘
                │
                ▼
     ┌──────────────────────┐
     │ Check request-header │
     │ configuration         │
     └──────────┬───────────┘
                │
                ▼
     ┌──────────────────────┐
     │ Patch / Verify       │
     │ fixed package        │
     └──────────────────────┘

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📊 Technical Summary

Property	Value
CVE	CVE-2026-63292
Product	Apache HTTP Server
Module	mod_vhost_alias
Vulnerability	Stack-based buffer overflow
CWE	CWE-121
Vector	Network
Authentication	Not required
Affected	2.4.0 – 2.4.68
Fixed	2.4.69
Primary Concern	Memory corruption
Safe Testing	Version + configuration checks

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📁 Repository Structure

CVE-2026-63292/
│
├── README.md
├── banner.png
├── CVE-2026-63292.py
├── requirements.txt
└── screenshots/
    └── lab-environment.png

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⚠️ Disclaimer

This project is intended for authorized security research, defensive testing, vulnerability analysis, and educational purposes.

Only test systems that you own or have explicit permission to assess.

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🔗 References

• Apache HTTP Server Security
• CVE / NVD vulnerability databases
• Apache HTTP Server documentation

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0xBlackash // Security Research

Understand • Verify • Patch • Secure