CVE-2026-3634
Libsoup: libsoup: http header injection and response splitting via crlf injection in content-type header
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.
INFO
Published Date :
March 17, 2026, 10:16 a.m.
Last Modified :
March 17, 2026, 2:20 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-3634
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | LOW | 53f830b8-0a3f-465b-8143-3b8a9948e749 | ||||
| CVSS 3.1 | LOW | [email protected] |
Solution
- Update libsoup to a version with fixed input sanitization.
- Validate and sanitize all user-supplied Content-Type header values.
- Implement strict input validation for header fields.
- Avoid setting Content-Type from untrusted input.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-3634.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-3634 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-3634
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-3634 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-3634 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Mar. 17, 2026
Action Type Old Value New Value Added Reference https://gitlab.gnome.org/GNOME/libsoup/-/issues/485 -
New CVE Received by [email protected]
Mar. 17, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:L Added CWE CWE-93 Added Reference https://access.redhat.com/security/cve/CVE-2026-3634 Added Reference https://bugzilla.redhat.com/show_bug.cgi?id=2445129 Added Reference https://gitlab.gnome.org/GNOME/libsoup/-/issues/485