The Quarterly Threat Landscape Report is out. See what attackers are targeting now.Read report
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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade apache2 | May 6, 2026 | May 4, 2026 |
| Amazon Linux Ami 2 | — | Upgrade httpd-debuginfoUpgrade mod_ldapUpgrade httpdUpgrade httpd-filesystemUpgrade httpd-develUpgrade httpd-manualUpgrade mod_proxy_htmlUpgrade mod_sessionUpgrade httpd-toolsUpgrade mod_mdUpgrade mod_ssl | Jun 8, 2026 | Jun 8, 2026 |
| Amazon_linux_2023 | — | Upgrade httpd-tools-debuginfoUpgrade mod_luaUpgrade httpdUpgrade mod_sessionUpgrade mod_sslUpgrade mod_session-debuginfoUpgrade mod_lua-debuginfoUpgrade mod_ldapUpgrade httpd-filesystemUpgrade httpd-debuginfoUpgrade mod_proxy_html-debuginfoUpgrade httpd-develUpgrade mod_ldap-debuginfoUpgrade httpd-manualUpgrade httpd-toolsUpgrade mod_ssl-debuginfoUpgrade httpd-core-debuginfoUpgrade httpd-coreUpgrade mod_proxy_htmlUpgrade httpd-debugsource | 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-bin (Ubuntu Pro)Upgrade libapache2-mod-proxy-html (Ubuntu Pro)Upgrade apache2Upgrade apache2-suexec-pristine (Ubuntu Pro)Upgrade libapache2-mod-md (Ubuntu Pro)Upgrade apache2 (Ubuntu Pro)Upgrade apache2-suexec-custom (Ubuntu Pro)Upgrade apache2.2-bin (Ubuntu Pro)Upgrade apache2-dev (Ubuntu Pro)Upgrade apache2-ssl-dev (Ubuntu Pro)Upgrade apache2-utils (Ubuntu Pro)Upgrade apache2-suexec (Ubuntu Pro)Upgrade libapache2-mod-macro (Ubuntu Pro)Upgrade libapache2-mod-proxy-uwsgi (Ubuntu Pro)Upgrade apache2-mpm-itk (Ubuntu Pro)Upgrade apache2-mpm-worker (Ubuntu Pro)Upgrade apache2-mpm-prefork (Ubuntu Pro)Upgrade apache2-mpm-event (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 |
With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.
Explore Intelligence Hub