CVE-2026-63718

Publication date 1 October 2026

Last updated 11 November 2026

Ubuntu priority

Cvss 3 Severity Score

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.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
apache2	26.10 stonking	Fixed in 2.4.68-1ubuntu6.1
	26.04 LTS resolute	Fixed in 2.4.66-2ubuntu2.6
	24.04 LTS noble	Fixed in 2.4.58-1ubuntu8.17
	22.04 LTS jammy	Fixed in 2.4.52-1ubuntu4.25
	20.04 LTS focal	Fixed in 2.4.41-4ubuntu3.23+esm9
	18.04 LTS bionic	Not affected
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not affected

Get expanded security coverage with Ubuntu Pro

Reduce your average CVE exposure time from 98 days to 1 day with expanded CVE patching, ten-years security maintenance and optional support for the full stack of open-source applications. Free for personal use.

Get Ubuntu Pro 30-day free trial

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
apache2	Upstream: 7c32a06

Severity score breakdown

CVSS version: CVSS v3.0

Base score 7.5 · High

Base metrics

Parameter	Value
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality impact	None
Integrity impact	High
Availability impact	None

Scores

Parameter	Value
Base score	7.5 · High
Exploitability score	-
Impact score	-

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

References

Related Ubuntu Security Notices (USN)

USN-8931-1
Apache HTTP Server vulnerabilities
14 October 2026

USN-9016-1
Apache HTTP Server vulnerabilities
10 November 2026