CVE-2026-1536

A flaw was found in libsoup. An attacker who can control the input for the Content-Disposition header can inject CRLF (Carriage Return Line Feed) sequences into the header value. These sequences are then interpreted verbatim when the HTTP request or response is constructed, allowing arbitrary HTTP headers to be injected. This vulnerability can lead to HTTP header injection or HTTP response splitting without requiring authentication or user interaction.

This is a MODERATE impact flaw in the libsoup HTTP library, allowing CRLF injection via the soup_message_headers_set_content_disposition() function. An attacker controlling input to the Content-Disposition header can inject arbitrary HTTP headers. Red Hat products are affected if they use libsoup in a configuration that passes unsanitized, untrusted input to this function.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.