HTTP response splitting vulnerability in multiple Apache HTTP Server modules with untrusted or compromised backend servers.
This issue affects Apache HTTP Server: from through 2.4.66.
Users are recommended to upgrade to version 2.4.67, which fixes the issue.
CVSS Details
- CVSS 3.1 Base Score: 6.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade apache2 | May 6, 2026 | May 4, 2026 |
| Amazon Linux Ami 2 | — | Upgrade httpd-debuginfoUpgrade httpd-filesystemUpgrade httpdUpgrade mod_ldapUpgrade httpd-toolsUpgrade mod_sessionUpgrade httpd-manualUpgrade mod_sslUpgrade httpd-develUpgrade mod_proxy_htmlUpgrade mod_md | Jun 8, 2026 | Jun 8, 2026 |
| Amazon_linux_2023 | — | Upgrade mod_proxy_html-debuginfoUpgrade httpd-filesystemUpgrade mod_luaUpgrade httpd-tools-debuginfoUpgrade mod_ldapUpgrade httpd-develUpgrade mod_sslUpgrade mod_lua-debuginfoUpgrade mod_session-debuginfoUpgrade httpdUpgrade mod_sessionUpgrade httpd-debuginfoUpgrade mod_ssl-debuginfoUpgrade httpd-toolsUpgrade httpd-coreUpgrade httpd-debugsourceUpgrade mod_proxy_htmlUpgrade httpd-core-debuginfoUpgrade httpd-manualUpgrade mod_ldap-debuginfo | May 28, 2026 | May 4, 2026 |
| Apache Httpd | — | Upgrade to the latest version of Apache HTTPD | May 5, 2026 | May 4, 2026 |
| Debian | — | Upgrade apache2 | May 7, 2026 | May 7, 2026 |
| Freebsd | — | Upgrade apache24 | May 6, 2026 | May 5, 2026 |
| Gentoo Linux | — | Upgrade www-servers/apache. | Aug 16, 2026 | Aug 13, 2026 |
| Ibm Http_server | — | Apply IBM HTTP Server version 8.5.5.30 or laterApply IBM HTTP Server Interim Fix PH71061Apply IBM HTTP Server version 9.0.5.28 or later | May 28, 2026 | May 11, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | May 4, 2026 |
| Ubuntu | — | Upgrade apache2-mpm-event (Ubuntu Pro)Upgrade apache2-suexec-custom (Ubuntu Pro)Upgrade apache2-utils (Ubuntu Pro)Upgrade apache2-ssl-dev (Ubuntu Pro)Upgrade apache2-dev (Ubuntu Pro)Upgrade apache2-mpm-itk (Ubuntu Pro)Upgrade apache2-suexec (Ubuntu Pro)Upgrade libapache2-mod-proxy-uwsgi (Ubuntu Pro)Upgrade libapache2-mod-macro (Ubuntu Pro)Upgrade apache2.2-bin (Ubuntu Pro)Upgrade apache2-mpm-prefork (Ubuntu Pro)Upgrade apache2-mpm-worker (Ubuntu Pro)Upgrade apache2Upgrade libapache2-mod-md (Ubuntu Pro)Upgrade apache2 (Ubuntu Pro)Upgrade apache2-suexec-pristine (Ubuntu Pro)Upgrade apache2-bin (Ubuntu Pro)Upgrade libapache2-mod-proxy-html (Ubuntu Pro) | May 7, 2026 | May 6, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jun 29, 2026 | May 4, 2026 |
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