Heap-based Buffer Overflow vulnerability in mod_proxy_ajp of Apache HTTP Server. If mod_proxy_ajp connects to a malicious AJP server this AJP server can send a malicious AJP message back to mod_proxy_ajp and cause it to write 4 attacker controlled bytes after the end of a heap based buffer.
This issue affects Apache HTTP Server: 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 |
|---|---|---|---|---|
| Alma_linux | — | Upgrade mod_proxy_htmlUpgrade httpdUpgrade httpd-develUpgrade httpd-toolsUpgrade mod_mdUpgrade mod_http2Upgrade mod_sessionUpgrade mod_luaUpgrade mod_sslUpgrade httpd-coreUpgrade httpd-filesystemUpgrade httpd-manualUpgrade mod_ldap | May 31, 2026 | May 27, 2026 |
| Alpine Linux | — | Upgrade apache2 | May 7, 2026 | May 5, 2026 |
| Amazon Linux Ami 2 | — | Upgrade mod_proxy_htmlUpgrade mod_ldapUpgrade mod_sslUpgrade httpd-filesystemUpgrade httpd-debuginfoUpgrade mod_sessionUpgrade mod_mdUpgrade httpd-develUpgrade httpdUpgrade httpd-manualUpgrade httpd-tools | Jun 8, 2026 | Jun 8, 2026 |
| Amazon_linux_2023 | — | Upgrade mod_session-debuginfoUpgrade mod_ldap-debuginfoUpgrade httpd-coreUpgrade mod_proxy_html-debuginfoUpgrade mod_sessionUpgrade httpd-manualUpgrade mod_sslUpgrade httpd-debuginfoUpgrade mod_lua-debuginfoUpgrade mod_ldapUpgrade httpd-filesystemUpgrade httpd-debugsourceUpgrade httpdUpgrade httpd-develUpgrade mod_ssl-debuginfoUpgrade mod_proxy_htmlUpgrade httpd-toolsUpgrade httpd-tools-debuginfoUpgrade mod_luaUpgrade httpd-core-debuginfo | May 28, 2026 | May 5, 2026 |
| Apache Httpd | — | Upgrade to the latest version of Apache HTTPD | May 7, 2026 | May 5, 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 9.0.5.28 or laterApply IBM HTTP Server version 8.5.5.30 or laterApply IBM HTTP Server Interim Fix PH71061 | May 28, 2026 | May 11, 2026 |
| Redhat_linux | — | No solution existsUpgrade mod_http2Upgrade mod_mdUpgrade httpd-develUpgrade httpd-core-debuginfoUpgrade mod_ldap-debuginfoUpgrade mod_sslUpgrade httpd-coreUpgrade mod_md-debugsourceUpgrade mod_proxy_htmlUpgrade httpd-toolsUpgrade httpd-debugsourceUpgrade mod_http2-debugsourceUpgrade httpd-manualUpgrade mod_sessionUpgrade mod_http2-debuginfoUpgrade mod_md-debuginfoUpgrade httpd-debuginfoUpgrade mod_ldapUpgrade mod_luaUpgrade httpdUpgrade httpd-tools-debuginfoUpgrade httpd-filesystemUpgrade mod_lua-debuginfoUpgrade mod_proxy_html-debuginfoUpgrade mod_ssl-debuginfoUpgrade mod_session-debuginfo | Jun 3, 2026 | May 5, 2026 |
| Rocky_linux | — | Upgrade mod_lua-debuginfoUpgrade httpd-coreUpgrade mod_md-debuginfoUpgrade mod_sessionUpgrade mod_ldapUpgrade httpd-debugsourceUpgrade mod_sslUpgrade mod_proxy_html-debuginfoUpgrade httpd-core-debuginfoUpgrade httpd-toolsUpgrade httpdUpgrade mod_ldap-debuginfoUpgrade mod_mdUpgrade mod_http2-debugsourceUpgrade mod_md-debugsourceUpgrade mod_ssl-debuginfoUpgrade httpd-develUpgrade httpd-tools-debuginfoUpgrade mod_luaUpgrade httpd-debuginfoUpgrade mod_http2Upgrade mod_session-debuginfoUpgrade mod_http2-debuginfoUpgrade mod_proxy_html | Jun 1, 2026 | May 30, 2026 |
| Ubuntu | — | Upgrade libapache2-mod-md (Ubuntu Pro)Upgrade apache2-utils (Ubuntu Pro)Upgrade apache2 (Ubuntu Pro)Upgrade apache2-data (Ubuntu Pro)Upgrade apache2.2-bin (Ubuntu Pro)Upgrade apache2-ssl-dev (Ubuntu Pro)Upgrade apache2-bin (Ubuntu Pro)Upgrade apache2-dev (Ubuntu Pro)Upgrade apache2 | May 7, 2026 | May 6, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | May 5, 2026 |
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