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Ubuntu 18.04 Apache2 Important HTTP Response Issues USN-8338-2

ubuntu
Calendar Grey May 29, 2026
Dist Ubuntu Esm H88
Ubuntu addresses a crucial regression in Apache HTTP Server impacting LTS 18.04, resolving critical service interruptions.
USN-8338-1 introduced a regression in Apache HTTP Server

Summary

USN-8338-1 introduced a regression in Apache HTTP Server

Software Description:

- apache2: Apache HTTP server

Details:

USN-8338-1 fixed vulnerabilities in Apache HTTP Server. The update

introduced a regression that prevented mod_http2 from loading on Ubuntu

18.04 LTS. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

It was discovered that Apache HTTP Server incorrectly handled certain

response headers. An attacker could possibly use this issue to perform

HTTP response splitting attacks. This issue only affected Ubuntu 14.04

LTS. (CVE-2023-38709)

Will Dormann and David Warren discovered that Apache HTTP Server's HTTP/2

implementation did not properly reclaim memory when streams were reset by

clients. A remote attacker could possibly use this issue to cause Apache

HTTP Server to consume resources, leading to a denial of service. This

issue only affected Ubuntu 18.04 LTS. (CVE-2023-45802)

Keran Mu and Jianjun Chen discovere...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu important apache2 http response splitting

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 18.04 LTS
  apache2                         2.4.29-1ubuntu4.27+esm8
                                  Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-8338-2

https://ubuntu.com/security/notices/USN-8338-1

https://bugs.launchpad.net/bugs/2154546

Severity
important
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8338-2

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu important apache2 http response splitting

Package Information

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