Description
A flaw was found in libsoup. A remote attacker, by controlling the method parameter of the `soup_message_new()` function, could inject arbitrary headers and additional request data. This vulnerability, known as CRLF (Carriage Return Line Feed) injection, occurs because the method value is not properly escaped during request line construction, potentially leading to HTTP request injection.
Affected products
gnome: libsoup; redhat: enterprise linux
References3
- access.redhat.com/security/cve/CVE-2026-3633 Vendor Advisory
- bugzilla.redhat.com/show_bug.cgi?id=2445128 Issue TrackingVendor Advisory
- gitlab.gnome.org/GNOME/libsoup/-/issues/484 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: 19 · 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.