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.
Affected products
gnome: libsoup; redhat: enterprise linux
References4
- access.redhat.com/security/cve/CVE-2026-3634 Vendor Advisory
- bugzilla.redhat.com/show_bug.cgi?id=2445129 Issue TrackingVendor Advisory
- gitlab.gnome.org/GNOME/libsoup/-/issues/485 ExploitIssue TrackingVendor Advisory
- gitlab.gnome.org/GNOME/libsoup/-/issues/485 ExploitIssue TrackingVendor Advisory
Metrics
- CVSS 3.1
-
6.5
MEDIUM
Score source: NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N - EPSS — exploit probability
- 0% percentile: 13 · as of 12 November 2026
- CWE
- CWE-93
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.