HTTP Request Response Smuggling Vulnerability in Apache HTTP Server
CVE-2026-63718

7.5HIGH

Key Information:

Vendor

Apache
Status
Apache Http Server
Vendor
CVE Published:
1 October 2026

What is CVE-2026-63718?

The Apache HTTP Server is susceptible to a response smuggling vulnerability caused by inconsistent interpretation of crafted HTTP requests. This vulnerability arises through the 'mod_proxy_uwsgi' module when processing uwsgi responses that manipulate the Transfer-Encoding header. Attackers could exploit this flaw to smuggle malicious requests, potentially leading to unauthorized access or data leakage. The affected versions range from 2.4.30 to 2.4.68, necessitating prompt remedial action from users of the server.

Affected Version(s)

Apache HTTP Server 2.4.30 <= 2.4.68

References

https://httpd.apache.org/security/vulnerabilities_24.html
vendor-advisory

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Qing Xu
.