CVE-2026-3634

Name: CVE-2026-3634
Creator: NVD / NIST
Published: 2026-03-17T10:16:00.86+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.18%

Last modified Jun 17, 2026

CVE-2026-3634 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 0.18% chance of exploitation in the next 30 days.

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.

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

0.18%

8.2th 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-2026-3634Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2445129Issue Tracking, Vendor Advisory
https://gitlab.gnome.org/GNOME/libsoup/-/issues/485Exploit, Issue Tracking, Vendor Advisory
https://gitlab.gnome.org/GNOME/libsoup/-/issues/485Exploit, Issue Tracking, Vendor Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2026-3634?

How severe is CVE-2026-3634?

CVE-2026-3634 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.18% probability of exploitation in the next 30 days.

How do I fix CVE-2026-3634?

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-2026-3634?

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

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Source: NVD / NIST