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high advisory

CVE-2026-55203 HAProxy Integer Overflow in FastCGI Handling

An integer overflow vulnerability (CVE-2026-55203) in HAProxy through version 3.4.0 allows malicious FastCGI backends to desynchronize the FCGI framing parser, leading to request routing errors, response smuggling, or memory safety issues.

HAProxy vulnerability fastcgi integer-overflow webserver proxy
2r 3t