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4.3
Apache HTTP Server mod_proxy_cluster CRLF Injection via INFO Endpoint
CVE-2026-3234
Summary
A weakness in Apache HTTP Server's mod_proxy_cluster module lets attackers inject malicious data into the server's responses. This could allow them to manipulate the information sent to clients, but only if they have network access to the server's MCMP protocol port. No login is required to exploit this weakness. To protect your server, apply the latest security patches or updates.
Original title
A flaw was found in mod_proxy_cluster. This vulnerability, a Carriage Return Line Feed (CRLF) injection in the decodeenc() function, allows a remote attacker to bypass input validation. By injecti...
Original description
A flaw was found in mod_proxy_cluster. This vulnerability, a Carriage Return Line Feed (CRLF) injection in the decodeenc() function, allows a remote attacker to bypass input validation. By injecting CRLF sequences into the cluster configuration, an attacker can corrupt the response body of INFO endpoint responses. Exploitation requires network access to the MCMP protocol port, but no authentication is needed.
nvd CVSS3.1
4.3
Vulnerability type
CWE-93
Published: 12 Mar 2026 · Updated: 13 Mar 2026 · First seen: 12 Mar 2026