Critical Vulnerability in Apache HTTP Server (httpd): Arbitrary Code Execution Risk
Summary
ALSA-2026:59347: Low: httpd security update. Affects httpd versions < 2.4.62-13.el9_8.6. Fixed in 2.4.62-13.el9_8.6. How to fix ↓
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Background
The Apache HTTP Server, commonly referred to as httpd, is a widely-used web server software that provides a robust and extensible platform for serving web content. It is known for its performance, security features, and flexibility, making it a popular choice among developers and system administrators. However, recent vulnerabilities have raised concerns regarding its security, particularly in the mod_ldap module, which can lead to severe consequences if not addressed promptly.
Vulnerability Detail
The vulnerability identified as CVE-2026-29167 is a use-after-free issue in the mod_ldap module of the Apache HTTP Server. This flaw allows an attacker to execute arbitrary code or cause a denial of service by manipulating per-directory configurations. The vulnerability arises from improper handling of memory, which can be exploited to gain unauthorized access or disrupt service availability. The potential ramifications include complete system compromise and significant downtime for affected web services.
How To Fix
Minimum fixed version
2.4.62-13.el9_8.6
This is the first release that contains the fix.
sudo dnf update httpdTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, consider disabling the mod_ldap module if it is not essential for your application. This can be done by commenting out the LoadModule directive in the Apache configuration file. For example, locate the line:
LoadModule ldap_module modules/mod_ldap.so
and comment it out by adding a '#' at the beginning of the line:
#LoadModule ldap_module modules/mod_ldap.so
After making changes, restart the Apache server to apply the modifications.
Conclusion
The vulnerability in the Apache HTTP Server's mod_ldap module poses a significant risk of arbitrary code execution and denial of service. It is crucial for users to update their packages to the patched version to safeguard their systems. Implementing the suggested workaround can provide temporary relief while ensuring that the server remains secure.
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FAQ
CVE-2026-29167 is a vulnerability in the Apache HTTP Server's mod_ldap module that allows for arbitrary code execution or denial of service due to a use-after-free error.
You can use the Vulert platform to monitor and alert for open-source vulnerabilities in your software. By uploading your manifest file, you can check for vulnerabilities without requiring access to the code.
Failing to address this vulnerability can lead to unauthorized access, data breaches, and service disruptions, potentially resulting in significant financial and reputational damage.
Yes, temporarily disabling the mod_ldap module can mitigate the risk until the patch is applied. However, this should be considered a short-term solution.
For detailed information, including the CVSS score and acknowledgments, refer to the CVE page associated with CVE-2026-29167.
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