Ubuntu Security Notices USN-8384-1 USN-8384-1: Apache HTTP Server vulnerability Publication date 4 June 2026 Overview Apache HTTP Server could be made to consume excessive resources if it received specially crafted network traffic. Releases 26.04 LTS 25.10 24.04 LTS 22.04 LTS Open side navigation Close side navigation Packages Details Update instructions References Packages apache2 - Apache HTTP server Details It was discovered that Apache HTTP Server incorrectly handled certain cookie headers in the HTTP/2 implementation. A remote attacker could possibly use this issue to cause Apache HTTP Server to consume excessive resources, resulting in a denial of service. It was discovered that Apache HTTP Server incorrectly handled certain cookie headers in the HTTP/2 implementation. A remote attacker could possibly use this issue to cause Apache HTTP Server to consume excessive resources, resulting in a denial of service. Update instructions In general, a standard system update will make all the necessary changes. Learn more about how to get the fixes. The problem can be corrected by updating your system to the following package versions: Ubuntu Release Package Version 26.04 LTS resolute apache2 – 2.4.66-2ubuntu2.2 25.10 questing apache2 – 2.4.64-1ubuntu3.5 24.04 LTS noble apache2 – 2.4.58-1ubuntu8.13 22.04 LTS jammy apache2 – 2.4.52-1ubuntu4.21 Reduce your security exposure Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines. Get Ubuntu Pro References CVE-2026-49975 CVE-2026-49975