Apache HTTP Server CVE-2026-23918

Upgrade to Apache HTTP Server 2.4.67 immediately per the official Apache advisory at https://httpd.apache.org/security/vulnerabilities_24.html - this release contains the vendor-confirmed fix for the double-free vulnerability. For environments unable to patch immediately, disable HTTP/2 protocol support by removing or commenting out 'Protocols h2 h2c http/1.1' directives and unloading mod_http2 module, then restart Apache; this eliminates the vulnerable code path but degrades performance for HTTP/2 clients who will fall back to HTTP/1.1, causing increased latency and connection overhead for modern browsers and mobile clients. If disabling HTTP/2 is not operationally feasible, restrict authenticated access to HTTP/2 endpoints through network segmentation, requiring VPN or IP allowlisting for low-privilege authenticated users, though this mitigation is incomplete since authenticated attackers within the trust boundary retain exploit capability. No workaround fully mitigates the risk short of patching or disabling HTTP/2.