Apache mod_proxy_cluster CRLF Injection (CVE-2026-3234)
CVE-2026-3234 Published on March 12, 2026
Mod_proxy_cluster: mod_proxy_cluster: response body corruption via crlf injection
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.
Vulnerability Analysis
Timeline
Reported to Red Hat.
Made public.
Weakness Type
What is a CRLF Injection Vulnerability?
The software uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs.
CVE-2026-3234 has been classified to as a CRLF Injection vulnerability or weakness.
Products Associated with CVE-2026-3234
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