CVE-2026-3634: gnome libsoup CRLF Injection

Vulnerability summary

CVE-2026-3634 is a medium (CVSS 6.5) CRLF Injection vulnerability in gnome libsoup. EPSS estimates a 0.32% chance of exploitation in the next 30 days, higher than 23.3% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 17-03-2026
   PublishedVulnerability first disclosed.
2. 19-03-2026
   Last modifiedVulnerability information updated.

Description

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.

• CWE-93Improper Neutralization of CRLF Sequences ('CRLF Injection')The product 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.