CVE-2026-1801 MEDIUM

CVE-2026-1801: Libsoup: libsoup: http request smuggling via malformed chunk headers

Vendor Red Hat
Product Red Hat Enterprise Linux 10
Weakness CWE-444
Published February 3, 2026
Last update March 26, 2026

CVSS base score

5.3/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

What the vulnerability does

01Description

A flaw was found in libsoup, an HTTP client/server library. This HTTP Request Smuggling vulnerability arises from non-RFC-compliant parsing in the soup_filter_input_stream_read_line() logic, where libsoup accepts malformed chunk headers, such as lone line feed (LF) characters instead of the required carriage return and line feed (CRLF). A remote attacker can exploit this without authentication or user interaction by sending specially crafted chunked requests. This allows libsoup to parse and process multiple HTTP requests from a single network message, potentially leading to information disclosure.

Key dates

02Disclosure timeline

February 3, 2026 CVE published
March 26, 2026 Record updated