Linuxsecurity Apache HTTP Server Regression Vulnerability Disclosed
Article Content
- •USN-8571-1 introduced a regression in Apache HTTP Server affecting Ubuntu 20.04 LTS.
- •Critical vulnerabilities include CVE-2026-33007 and CVE-2026-33523, allowing denial of service and HTTP response splitting.
- •Administrators are urged to apply the USN-8571-2 update to prevent exploitation.
A regression in Apache HTTP Server was introduced by USN-8571-1, which failed to fully address vulnerabilities, leading to potential denial of service when HTTP/2 proxying is enabled. The vulnerabilities include CVE-2026-33007, which allows remote attackers to exploit memory operations, and CVE-2026-33523, which enables HTTP response splitting. The affected systems include Ubuntu 20.04 LTS running Apache2. The update, USN-8571-2, released on September 10, 2026, aims to fix the regression. Administrators are advised to update their systems to mitigate these vulnerabilities. The issue affects users who rely on Apache HTTP Server with HTTP/2 proxying enabled. The vulnerabilities were discovered by multiple researchers, highlighting the collaborative nature of security research.
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