CVE-2026-3633
Libsoup: libsoup: header and http request injection via crlf injection
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.
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-2026-3633
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
- Sanitize the method parameter in soup_message_new().
- Validate all user-supplied HTTP headers.
- Avoid using user input directly in HTTP requests.
- Apply vendor patches for libsoup.
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-2026-3633.
| URL | Resource |
|---|---|
| https://access.redhat.com/security/cve/CVE-2026-3633 | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2445128 | |
| https://gitlab.gnome.org/GNOME/libsoup/-/issues/484 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-3633 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-2026-3633
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-2026-3633 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-3633 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.
-
New CVE Received by [email protected]
Mar. 17, 2026
Action Type Old Value New Value Added 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. 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-2026-3633 Added Reference https://bugzilla.redhat.com/show_bug.cgi?id=2445128 Added Reference https://gitlab.gnome.org/GNOME/libsoup/-/issues/484