Critical Apache flaw CVE-2026-23918 disclosed May 2026 allows DoS and possible RCE, impacting HTTP Server installations worldwide.

A critical vulnerability affecting Apache HTTP Server’s HTTP/2 implementation could allow attackers to crash servers or potentially execute malicious code, security researchers have warned.

The flaw, tracked as CVE-2026-23918, was disclosed on May 5, 2026, by the Apache Software Foundation as part of a broader set of security updates. The issue has been assigned a high severity rating, with a CVSS score of 8.8.

According to advisories, the vulnerability is caused by a “double-free” memory handling bug in the HTTP/2 module (mod_http2). This flaw can be triggered by specially crafted HTTP/2 requests that force the server to improperly free memory twice, leading to memory corruption.

In its simplest form, exploitation can result in denial-of-service (DoS) attacks, allowing attackers to crash web servers with minimal effort. However, in certain configurations particularly those using specific memory handling mechanisms the flaw could also be leveraged for remote code execution (RCE), giving attackers deeper control over affected systems.

The vulnerability impacts Apache HTTP Server version 2.4.66 and earlier releases. It has been addressed in version 2.4.67, with users strongly urged to upgrade immediately to mitigate risk.

Security experts note that because Apache HTTP Server is one of the most widely used web server platforms globally, the flaw could expose a large number of internet-facing systems if left unpatched. The issue underscores ongoing risks tied to HTTP/2 implementations, which have been the source of several high-impact vulnerabilities in recent years.

Administrators are advised to apply patches without delay and review server configurations to reduce exposure, particularly in environments handling critical infrastructure or sensitive data.

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Critical Apache HTTP/2 Flaw Enables RCE Attacks