A flaw in libsoup’s HTTP header handling allows multiple Host: headers in a request and returns the last occurrence for server-side processing. Common front proxies often honor the first Host: header, so this mismatch can cause vhost confusion where a proxy routes a request to one backend but the backend interprets it as destined for another host. This discrepancy enables request-smuggling style attacks, cache poisoning, or bypassing host-based access controls when an attacker supplies duplicate Host headers.

A flaw in libsoup’s HTTP header handling allows multiple Host: headers in a request and returns the last occurrence for server-side processing. Common front proxies often honor the first Host: header, so this mismatch can cause vhost confusion where a proxy routes a request to one backend but the backend interprets it as destined for another host. This discrepancy enables request-smuggling style attacks, cache poisoning, or bypassing host-based access controls when an attacker supplies duplicate Host headers.

A flaw in libsoup’s HTTP header handling allows multiple Host: headers in a request and returns the last occurrence for server-side processing. Common front proxies often honor the first Host: header, so this mismatch can cause vhost confusion where a proxy routes a request to one backend but the backend interprets it as destined for another host. This discrepancy enables request-smuggling style attacks, cache poisoning, or bypassing host-based access controls when an attacker supplies duplicate Host headers.

Libsoup: libsoup: duplicate host header handling causes host-parsing discrepancy (first- vs last-value wins)

A flaw in libsoup\u2019s HTTP header handling allows multiple Host: he ...

Security update for libsoup

Important: libsoup3 security update

Important: libsoup security update

Important: libsoup security update

A flaw in libsoup’s HTTP header handling allows multiple Host: headers in a request and returns the last occurrence for server-side processing. Common front proxies often honor the first Host: header, so this mismatch can cause vhost confusion where a proxy routes a request to one backend but the backend interprets it as destined for another host. This discrepancy enables request-smuggling style attacks, cache poisoning, or bypassing host-based access controls when an attacker supplies duplicate Host headers.

ELSA-2026-0925: libsoup security update (IMPORTANT)

ELSA-2026-0423: libsoup3 security update (IMPORTANT)

ELSA-2026-0422: libsoup security update (IMPORTANT)

ELSA-2026-0421: libsoup security update (IMPORTANT)

Уязвимость библиотеки libsoup, связанная с недостатками обработки http-запросов, позволяющая нарушителю отправить скрытый HTTP-запрос (атака типа HTTP Request Smuggling)

Security update for libsoup2

Security update for libsoup2

Уязвимость libsoup

Security update for libsoup

Security update for libsoup