Apache HTTP Server 2.4.30-2.4.68 Response Smuggling via mod_proxy_uwsgi
CVE-2026-63718 Published on October 1, 2026
Apache HTTP Server: mod_proxy_uwsgi Transfer-Encoding response smuggling
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.
Vulnerability Analysis
CVE-2026-63718 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, a high impact on integrity, and no impact on availability.
Timeline
reported
fixed in 2.4.x by r1938691 79 days later.
2.4.69 released
Weakness Type
What is a HTTP Request Smuggling Vulnerability?
When malformed or abnormal HTTP requests are interpreted by one or more entities in the data flow between the user and the web server, such as a proxy or firewall, they can be interpreted inconsistently, allowing the attacker to "smuggle" a request to one device without the other device being aware of it.
CVE-2026-63718 has been classified to as a HTTP Request Smuggling vulnerability or weakness.
Products Associated with CVE-2026-63718
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Affected Versions
Apache Software Foundation Apache HTTP Server:- Version 2.4.30, <= 2.4.68 is affected.