CVE-2026-3633

Name: CVE-2026-3633
Creator: NVD / NIST
Published: 2026-03-17T10:16:00.677+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.22%

Last modified Jun 17, 2026

CVE-2026-3633 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 0.22% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

EPSS Probability

0.22%

12.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-93

Affected Software

Vendor	Product	Versions
Gnome	Libsoup	All versions
Redhat	Enterprise Linux	6.0
Redhat	Enterprise Linux	7.0
Redhat	Enterprise Linux	8.0
Redhat	Enterprise Linux	9.0
Redhat	Enterprise Linux	10.0

References

https://access.redhat.com/security/cve/CVE-2026-3633Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2445128Issue Tracking, Vendor Advisory
https://gitlab.gnome.org/GNOME/libsoup/-/issues/484Exploit, Issue Tracking, Vendor Advisory

Timeline

Published: Mar 17, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-3633?

How severe is CVE-2026-3633?

CVE-2026-3633 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.22% probability of exploitation in the next 30 days.

How do I fix CVE-2026-3633?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-3633?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST