Bug 2433834 (CVE-2026-1536)

Summary: CVE-2026-1536 libsoup: libsoup: HTTP header injection or response splitting via CRLF injection in Content-Disposition header
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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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.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On: 2433837, 2433839, 2433838    
Bug Blocks:    

Description OSIDB Bzimport 2026-01-28 14:02:00 UTC 
CRLF injection vulnerability in the soup_message_headers_set_content_disposition() function of the libsoup HTTP library. The issue occurs because this function internally uses soup_message_headers_append_common(), which does not enforce character restrictions on header values. As a result, an attacker who can control the input used for the Content-Disposition header can inject CRLF sequences into the header value. When the HTTP request or response is later constructed, these sequences are interpreted verbatim, allowing arbitrary HTTP headers to be injected. This can lead to header injection or HTTP response splitting without authentication or user interaction.