CVE-2026-3633

LOW

Libsoup: libsoup: header and http request injection via crlf injection

Title source: cna
STIX 2.1

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.

References (3)

Core 3
Core References
Vdb Entry, X_Refsource_Redhat vdb-entry x_refsource_redhat
https://access.redhat.com/security/cve/CVE-2026-3633
Issue Tracking, X_Refsource_Redhat issue-tracking x_refsource_redhat
RHBZ#2445128
https://bugzilla.redhat.com/show_bug.cgi?id=2445128

Scores

CVSS v3 3.9
EPSS 0.0022
EPSS Percentile 12.7%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:L

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-93
Status published
Products (11)
gnome/libsoup
Red Hat/Red Hat Enterprise Linux 10
Red Hat/Red Hat Enterprise Linux 6
Red Hat/Red Hat Enterprise Linux 7
Red Hat/Red Hat Enterprise Linux 8
Red Hat/Red Hat Enterprise Linux 9
redhat/enterprise_linux 6.0
redhat/enterprise_linux 7.0
redhat/enterprise_linux 8.0
redhat/enterprise_linux 9.0
... and 1 more
Published Mar 17, 2026
Tracked Since Mar 17, 2026