Critical Buffer Over-read Vulnerability in Apache HTTP Server (CVE-2026-34059)

apache2 Updated 05 May 2026

Summary

04/05/2026

Disclosed on

N/A

Severity

Yes i

Fix available

High

Severity

7.5

CVSS Score

ALPINE-CVE-2026-34059: Buffer Over-read vulnerability in Apache HTTP Server. Affects apache2 versions < 2.4.67-r0. Fixed in 2.4.67-r0. How to fix ↓

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Background

Apache HTTP Server is a widely-used open-source web server software that enables users to serve web content over the internet. Known for its flexibility and robust performance, Apache supports various features such as customizable error messages, authentication configurations, and URL redirection. However, like any software, it is susceptible to vulnerabilities that can compromise its security and functionality.

Vulnerability Detail

The vulnerability identified as CVE-2026-34059 is a buffer over-read issue in Apache HTTP Server versions up to 2.4.66. This flaw allows an attacker to read beyond the intended buffer limits, potentially exposing sensitive information. The origin of this vulnerability lies in improper handling of input data, which can lead to unauthorized access to memory contents. The ramifications of this vulnerability can be severe, as it may allow attackers to extract confidential data from the server's memory, leading to data breaches and loss of user trust.

How To Fix

Minimum fixed version

2.4.67-r0

This is the first release that contains the fix.

sudo apk add --upgrade apache2

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Workaround

As a temporary workaround, users can implement stricter input validation and monitoring to limit the exposure of sensitive data. However, this is not a substitute for upgrading the software to the latest version.

Conclusion

In summary, CVE-2026-34059 is a critical buffer over-read vulnerability affecting Apache HTTP Server versions up to 2.4.66. Users are strongly advised to upgrade to version 2.4.67 to mitigate the risks associated with this vulnerability. Regular monitoring and updating of software are essential to maintain security.

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