CVE-2026-2708

Description

A request smuggling vulnerability exists in libsoup's HTTP/1 header parsing logic. The soup_message_headers_append_common() function in libsoup/soup-message-headers.c unconditionally appends each header value without validating for duplicate or conflicting Content-Length fields. This allows an attacker to send HTTP requests containing multiple Content-Length headers with differing values.

CVSS Vector

References

• https://access.redhat.com/security/cve/CVE-2026-2708
• https://bugzilla.redhat.com/show_bug.cgi?id=2440743
• https://gitlab.gnome.org/GNOME/libsoup/-/issues/500
• https://gitlab.gnome.org/GNOME/libsoup/-/merge_requests/513