Apache HTTP Server HTTP/2 Double Free DoS RCE | MSSP Advisory
Critical
DateMay 5, 2026
📋Executive Summary
Apache HTTP Server contains a critical double free vulnerability in HTTP/2 protocol handling (CVE-2026-23918) with a CVSS score of 8.8 that enables denial of service attacks and potential remote code execution. The flaw affects Apache HTTP Server installations running HTTP/2, which is enabled by default in most modern deployments. Attackers can exploit this through crafted HTTP/2 requests without authentication.
⚠️Why It Matters for MSSPs
Your own infrastructure likely runs Apache HTTP Server for client portals, monitoring dashboards, or internal applications, making your entire operation vulnerable to shutdown or compromise. Every client running web applications on Apache HTTP/2 faces immediate risk of service disruption and potential data breach, and they expect you to know about this before their sites go down.
✅Recommended Action
Patch all Apache HTTP Server instances to the latest version immediately and disable HTTP/2 protocol support as a temporary mitigation if patching cannot be completed within 24 hours.
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🏷️Threat Category
Vulnerability Disclosure
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