Description
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.
Problem types
Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Product status
Timeline
| 2026-02-03: | Reported to Red Hat. |
| 2026-02-03: | Made public. |
Credits
Red Hat would like to thank Ahmed Lekssays for reporting this issue.
References
access.redhat.com/security/cve/CVE-2026-1801
bugzilla.redhat.com/show_bug.cgi?id=2436315 (RHBZ#2436315)