Inconsistent interpretation of HTTP requests in Apache HTTP Server - CVE-2026-63718
Published: October 1, 2026
Vulnerability identifier: #VU153106
CSH Severity: Low
CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-63718
CWE-ID: CWE-444
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform HTTP response smuggling.
The vulnerability exists due to inconsistent interpretation of HTTP responses in mod_proxy_uwsgi when processing a crafted uwsgi response with a Transfer-Encoding header. A remote attacker can send a crafted uwsgi response to perform HTTP response smuggling.
Affected software
Apache HTTP Server
How to mitigate CVE-2026-63718
Install security update from vendor's website.
Apache HTTP Server - update to 2.4.69