CVE-2026-46729
Received Received - Intake

NULL Pointer Dereference in Apache HTTP Server mod_heartmonitor

Publication date: 2026-10-01

Last updated on: 2026-10-01

Assigner: Apache Software Foundation

Description
NULL Pointer Dereference vulnerability in Apache HTTP Servers mod_heartmonitor over unicast listener. This issue affects Apache HTTP Server: from 2.4.0 through 2.4.68.

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Meta Information

Published
2026-10-01
Last Modified
2026-10-01
Generated
2026-10-01
AI Q&A
2026-10-01
EPSS Evaluated
N/A
NVD
CVE-2026-46729
EUVD
EUVD-2026-90887

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
apache http_server From 2.4.0 (inc) to 2.4.68 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-476 The product dereferences a pointer that it expects to be valid but is NULL.

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Executive Summary

This is a NULL pointer dereference vulnerability in Apache HTTP Server's mod_heartmonitor module when using a unicast listener. It affects versions 2.4.0 through 2.4.68. A NULL pointer dereference occurs when the program attempts to access memory at address zero, which typically leads to crashes or undefined behavior.

Detection Guidance

Detection involves checking Apache HTTP Server versions between 2.4.0 and 2.4.68. Use commands like 'httpd -v' or 'apache2 -v' to verify the installed version. Inspect logs for mod_heartmonitor-related errors or crashes.

Impact Analysis

This vulnerability can cause Apache HTTP Server to crash or become unresponsive, leading to denial of service. Attackers may exploit it to disrupt web services running on affected servers.

Compliance Impact

This vulnerability does not directly affect compliance with standards like GDPR or HIPAA as it is a technical issue related to a NULL pointer dereference in Apache HTTP Server's mod_heartmonitor. However, if exploited, it could lead to denial-of-service conditions which may impact availability of systems handling sensitive data, potentially affecting compliance indirectly.

Mitigation Strategies

Upgrade Apache HTTP Server to a version beyond 2.4.68. If upgrading is not immediately possible, disable the mod_heartmonitor module by removing or commenting its LoadModule directive in the Apache configuration files.

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