Real-World CVE HTTP Request Smuggling Apache mod_proxy Example

📰 Dev.to · Stefan

Learn how to reproduce and patch a request smuggling desync in Apache mod_proxy_ajp using a real-world CVE example

advanced Published 26 Jun 2026
Action Steps
  1. Reproduce the CVE-2022-26377 vulnerability using Apache mod_proxy_ajp
  2. Apply the upstream patch to fix the desync issue
  3. Configure hardening settings to prevent similar attacks
  4. Test the patched configuration to ensure the vulnerability is closed
  5. Implement additional security measures to prevent request smuggling attacks
Who Needs to Know This

Security engineers and DevOps teams can benefit from this example to harden their Apache configurations and prevent request smuggling attacks

Key Insight

💡 Request smuggling desync in Apache mod_proxy_ajp can be exploited, but patching and config hardening can prevent attacks

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🚨 Fix CVE-2022-26377: Reproduce & patch request smuggling desync in Apache mod_proxy_ajp 🚨

Key Takeaways

Learn how to reproduce and patch a request smuggling desync in Apache mod_proxy_ajp using a real-world CVE example

Full Article

A reproducible walkthrough of CVE-2022-26377, a request smuggling desync in Apache mod_proxy_ajp, plus the upstream patch and config hardening that close it.
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