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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.

PUBLISHED Reserved 2026-03-06 | Published 2026-03-17 | Updated 2026-03-19 | Assigner redhat




LOW: 3.9CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:L

Problem types

Improper Neutralization of CRLF Sequences ('CRLF Injection')

Product status

Default status
affected

Default status
unknown

Default status
affected

Default status
affected

Default status
affected

Timeline

2026-03-06:Reported to Red Hat.
2026-03-06:Made public.

Credits

Red Hat would like to thank Codean Labs for reporting this issue.

References

gitlab.gnome.org/GNOME/libsoup/-/issues/485 exploit

access.redhat.com/security/cve/CVE-2026-3634 vdb-entry

bugzilla.redhat.com/show_bug.cgi?id=2445129 (RHBZ#2445129) issue-tracking

gitlab.gnome.org/GNOME/libsoup/-/issues/485

cve.org (CVE-2026-3634)

nvd.nist.gov (CVE-2026-3634)

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