CVE-2026-63718
Received Received - Intake

HTTP Request Smuggling in Apache HTTP Server

Publication date: 2026-10-01

Last updated on: 2026-10-01

Assigner: Apache Software Foundation

Description
Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') response smuggling vulnerability in Apache HTTP Server via mod_proxy_uwsgi and a crafted uwsgi response with Transfer-Encoding. This issue affects Apache HTTP Server: from 2.4.30 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-2026-63718
EUVD
EUVD-2026-90906

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
apache http_server From 2.4.30 (inc) to 2.4.68 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-444 The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.

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Executive Summary

This is an HTTP Request/Response Smuggling vulnerability in Apache HTTP Server affecting versions 2.4.30 through 2.4.68. It occurs via mod_proxy_uwsgi when a crafted uwsgi response with Transfer-Encoding header is processed, leading to inconsistent interpretation of HTTP requests or responses.

Impact Analysis

An attacker could exploit this to smuggle malicious requests or responses, bypass security controls, or manipulate how the server processes traffic. This may lead to unauthorized access, data leaks, or service disruption.

Compliance Impact

This vulnerability involves HTTP request/response smuggling due to inconsistent interpretation of responses in Apache HTTP Server. It may lead to unauthorized data exposure or manipulation, potentially violating GDPR's data protection requirements or HIPAA's integrity and confidentiality rules if exploited.

Mitigation Strategies

Upgrade Apache HTTP Server to a version outside the affected range (2.4.30 through 2.4.68). Disable mod_proxy_uwsgi if not required. Monitor network traffic for unusual HTTP request patterns.

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