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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.

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

access.redhat.com/security/cve/CVE-2026-3633 vdb-entry

bugzilla.redhat.com/show_bug.cgi?id=2445128 (RHBZ#2445128) issue-tracking

gitlab.gnome.org/GNOME/libsoup/-/issues/484

cve.org (CVE-2026-3633)

nvd.nist.gov (CVE-2026-3633)

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