CVE-2026-42536
Received Received - Intake
Heap-based Buffer Overflow in Apache HTTP Server

Publication date: 2026-06-08

Last updated on: 2026-06-08

Assigner: Apache Software Foundation

Description
Heap-based Buffer Overflow vulnerability in Apache HTTP Server with mod_xml2enc, xml2StartParse, and untrusted content 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-2026-42536
EUVD
EUVD-2026-35100
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
apache http_server 2.4.68
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-122 A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
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Executive Summary

This vulnerability is a heap-based buffer overflow in the Apache HTTP Server, specifically involving the mod_xml2enc module and the xml2StartParse function when processing untrusted content.

A heap-based buffer overflow occurs when a program writes more data to a buffer located in the heap than it can hold, potentially leading to memory corruption.

Impact Analysis

Exploitation of this heap-based buffer overflow could allow an attacker to cause a crash or potentially execute arbitrary code on the affected server.

This could lead to denial of service or unauthorized control over the server running the vulnerable Apache HTTP Server versions from 2.4.0 through 2.4.67.

Mitigation Strategies

Users are recommended to upgrade Apache HTTP Server to version 2.4.68, which fixes the heap-based buffer overflow vulnerability in mod_xml2enc.

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