Millions at Risk: Apache HTTP Server Fixes Critical Remote Code Execution Flaw
Ddos 
The Apache HTTP Server Project, the long-standing standard for secure and extensible web services on UNIX and Windows, has released a series of security updates to address a wide range of vulnerabilities. Leading the pack is a high-stakes “Important” severity flaw that could lead to Remote Code Execution (RCE), alongside several other bugs impacting authentication and memory safety.
Administrators are urged to upgrade to version 2.4.67 to secure their infrastructure against these newly disclosed threats.
The most severe vulnerability in this release, CVE-2026-23918, impacts systems utilizing the HTTP/2 protocol. This flaw involves a Double Free condition that can be triggered by an “early reset” of a connection.
If successfully exploited, this vulnerability could allow an attacker to achieve Remote Code Execution (RCE) on the server. This specific issue is known to affect version 2.4.66.
Two “Moderate” severity flaws target the fundamental security boundaries of the server, specifically regarding how users are authenticated and how local permissions are enforced:
- Digest Authentication Timing Attack (CVE-2026-33006): A timing attack against mod_auth_digest allows a remote attacker to bypass Digest authentication entirely.
- Local Privilege Escalation (CVE-2026-24072): An escalation bug in various modules allows authors of .htaccess files to read system files with the full privileges of the httpd user. This vulnerability effectively allows a lower-privileged local user to “break out” of their restricted environment.
The update also cleans up several memory-related issues, primarily within the AJP (Apache JServ Protocol) and caching modules:
- Mod_proxy_ajp Buffer Risks: A trio of low-severity vulnerabilities—CVE-2026-34059, CVE-2026-34032, and CVE-2026-33857—address heap over-reads and out-of-bounds reads. These flaws stem from missing null-termination checks and off-by-one errors in AJP getter functions, which could lead to unintended memory disclosure.
- NULL Pointer Crashes: Both mod_authn_socache (CVE-2026-33007) and mod_dav_lock (CVE-2026-29169) were found to contain NULL pointer dereferences. These flaws allow unauthenticated remote users to crash server processes, leading to a Denial of Service (DoS).
The Apache HTTP Server Project strongly recommends that all users running versions up to 2.4.66 upgrade to version 2.4.67. For those unable to upgrade immediately, removing mod_dav_lock is a viable workaround for CVE-2026-29169, as the module is rarely used in modern environments.
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