CVE-2026-44631
Received Received - Intake
Buffer Underwrite in Apache HTTP Server

Publication date: 2026-06-08

Last updated on: 2026-06-08

Assigner: Apache Software Foundation

Description
Buffer Underwrite vulnerability in Apache HTTP Server on crafted regular expressions in the configuration. This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67. Users are recommended to upgrade to version 2.4.68, which fixes the issue.
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Meta Information
Published
2026-06-08
Last Modified
2026-06-08
Generated
2026-06-09
AI Q&A
2026-06-08
EPSS Evaluated
N/A
NVD
CVE-2026-44631
EUVD
EUVD-2026-35095
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
apache http_server From 2.4.0 (inc) to 2.4.67 (inc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-124 The product writes to a buffer using an index or pointer that references a memory location prior to the beginning of the buffer.
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Executive Summary

This vulnerability is a Buffer Underwrite issue found in the Apache HTTP Server. It occurs when the server processes crafted regular expressions in its configuration, which can lead to memory being written outside the intended buffer boundaries.

The affected versions are Apache HTTP Server from 2.4.0 through 2.4.67. The issue is resolved in version 2.4.68.

Impact Analysis

A Buffer Underwrite vulnerability can lead to unpredictable behavior such as application crashes, data corruption, or potentially allow an attacker to execute arbitrary code. This can compromise the stability and security of the Apache HTTP Server.

Mitigation Strategies

Users are recommended to upgrade Apache HTTP Server to version 2.4.68, which fixes the buffer underwrite vulnerability caused by crafted regular expressions in the configuration.

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