CVE-2026-34355
Analyzed Analyzed - Analysis Complete

Buffer Overflow in Apache HTTP Server mod_proxy_html

Publication date: 2026-06-08

Last updated on: 2026-06-09

Assigner: Apache Software Foundation

Description
A buffer overflow in mod_proxy_html in Apache HTTP Server 2.4.67 and earlier allows an attack by an untrusted backend. Users are recommended to upgrade to version 2.4.68, which fixes this issue.

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Meta Information

Published
2026-06-08
Last Modified
2026-06-09
Generated
2026-06-29
AI Q&A
2026-06-09
EPSS Evaluated
2026-06-27
NVD
CVE-2026-34355
EUVD
EUVD-2026-35097

Affected Vendors & Products

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

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().

Attack-Flow Graph

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Compliance Impact

The provided information does not specify any direct impact of this vulnerability on compliance with common standards and regulations such as GDPR or HIPAA.

Executive Summary

This vulnerability is a buffer overflow in the mod_proxy_html module of the Apache HTTP Server versions 2.4.67 and earlier. It allows an attack by an untrusted backend, meaning that if the backend server is compromised or malicious, it can exploit this flaw to cause unexpected behavior or potentially execute arbitrary code.

Users are advised to upgrade to version 2.4.68, where this issue has been fixed.

Impact Analysis

The buffer overflow vulnerability can lead to serious security risks such as denial of service, data corruption, or remote code execution if exploited by an attacker controlling the backend server. This could compromise the stability and security of the Apache HTTP Server, potentially allowing unauthorized access or control.

Mitigation Strategies

Users are recommended to upgrade Apache HTTP Server to version 2.4.68, which fixes the buffer overflow vulnerability in mod_proxy_html.

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