🛡️ MGASA-2026-0250 — haproxy

Updated haproxy packages fix security vulnerability

HAProxy through 3.4.0, fixed in commit 5985276, contains an integer overflow

vulnerability in the fcgi_conn structure's drl field that allows buffer

misparse as new FCGI record headers. When contentLength is 65535 and

paddingLength is 1 or more, the drl field wraps to 0, causing incorrect

record consumption and allowing malicious FastCGI backends to desynchronize

the FCGI framing parser, potentially causing request routing errors, response

smuggling, or memory safety issues.

(CVE-2026-55203)

HAProxy through 3.4.0, fixed in commit 9a6d1fe, contains a null pointer

dereference vulnerability in hpack_dht_insert() within src/hpack-tbl.c that

fails to validate the return value of hpack_dht_defrag() when the memory pool

is exhausted. An attacker can trigger HPACK dynamic table insertions under

memory pressure to dereference a NULL pointer and crash HAProxy worker

processes, causing denial of service.

(CVE-2026-55204)