Apache HTTP Server 2.4.67 Security Advisory — Immediate Action Required

Mohamed Magdy

Mohamed Magdy

— 1 min read
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Apache HTTP Server 2.4.67 Security Advisory — Immediate Action Required
Apache HTTP Server 2.4.67 Vulnerabilities

Table of Contents

Overview

The Apache Software Foundation has disclosed multiple security vulnerabilities affecting the Apache HTTP Server, including a high-impact remote code execution issue.

Any system running 2.4.66 or earlier is exposed.

All issues are fixed in 2.4.67.

Summary:

  • 5 vulnerabilities patched
  • 1 critical RCE (CVE-2026-23918)
  • Upgrade is the only full fix

Critical Issue: CVE-2026-23918 (CVSS 8.8)

Root Cause

A double-free memory corruption bug in the HTTP/2 implementation.

Attack Flow

  1. Server allocates memory for a request
  2. Attacker sends a crafted HTTP/2 early reset frame
  3. Memory is freed twice
  4. Heap corruption occurs

Impact

  • Crash (DoS)
  • Remote Code Execution (worst case)

Scope

  • Affects only 2.4.66

Privilege Escalation: CVE-2026-24072

A flaw in mod_rewrite allows local privilege abuse.

Behavior

  • Read arbitrary files
  • Executes under Apache process context

Risk

  • Cross-account data exposure in shared hosting
  • Access to sensitive configs and credentials

Additional Fixes in 2.4.67

CVE-2026-28780 — mod_proxy_ajp

  • Heap buffer overflow
  • Malicious AJP backend
  • Low severity

CVE-2026-29168 — mod_md

  • Resource exhaustion via OCSP

CVE-2026-29169 — mod_dav_lock

  • NULL pointer dereference
  • Unauthenticated crash
  • Legacy Subversion relevance

Immediate Mitigation Steps

1. Upgrade to 2.4.67

httpd -v
# or
apache2 -v

2. If upgrade is delayed: disable HTTP/2

# Comment out or remove
LoadModule http2_module modules/mod_http2.so

# or if using cPanel/WHM
yum/dnf remove ea-apache24-mod_http2

3. Remove unused modules

# Example (cPanel EA4)
yum remove ea-apache24-mod_dav_lock

4. Restrict .htaccess write access

  • Audit user permissions
  • Prefer centralized configs
AllowOverride None

5. Review loaded modules

apachectl -M

FAQs

Is disabling HTTP/2 enough?

No. It removes the RCE vector only. Other issues remain.

How do I check my version?

httpd -v
# or
apache2 -v

Is this being actively exploited?

No confirmed exploitation as of May 5, 2026. Expect PoCs soon.

Where to get the patch?

From official Apache distribution channels.

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