libsoup CRLF Header Injection via Content-Type Header
CVE-2026-3634 Published on March 17, 2026
Libsoup: libsoup: http header injection and response splitting via crlf injection in content-type header
A flaw was found in libsoup. An attacker controlling the value used to set the Content-Type header can inject a Carriage Return Line Feed (CRLF) sequence due to improper input sanitization in the `soup_message_headers_set_content_type()` function. This vulnerability allows for the injection of arbitrary header-value pairs, potentially leading to HTTP header injection and response splitting attacks.
Vulnerability Analysis
CVE-2026-3634 is exploitable with network access, requires user interaction and user privileges. This vulnerability is consided to have a high level of attack complexity. Public availability of a proof of concept (POC) exploit exists for CVE-2026-3634. The potential impact of an exploit of this vulnerability is considered to be low. considered to have a small impact on confidentiality and integrity and availability.
Timeline
Reported to Red Hat.
Made public.
Weakness Type
What is a CRLF Injection Vulnerability?
The software uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs.
CVE-2026-3634 has been classified to as a CRLF Injection vulnerability or weakness.
Products Associated with CVE-2026-3634
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