CVE-2026-3633 Details
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.
A CRLF injection vulnerability has been identified in libsoup, specifically within the 'soup_message_new()' function. This issue allows remote attackers to inject arbitrary HTTP headers and request data by manipulating the method parameter. The vulnerability arises because the method value is not properly sanitized before being used to construct the request line, potentially leading to HTTP request injection.
To address this vulnerability, it is recommended to sanitize or reject method values that contain invalid characters, including any whitespace. A patch has been proposed and is under review.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 17, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2026-3633 | [email protected] | Vendor Advisory |
| https://bugzilla.redhat.com/show_bug.cgi?id=2445128 | [email protected] | Issue TrackingVendor Advisory |
| https://gitlab.gnome.org/GNOME/libsoup/-/issues/484 | [email protected] | ExploitIssue TrackingVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-93 | Improper Neutralization of CRLF Sequences ('CRLF Injection') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| gnome libsoup | All versions |
CPE
Remediation
| |
| redhat enterprise linux | 6.0 7.0 8.0 9.0 10.0 |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Mar 19, 2026 | Initial Analysis | [email protected] |
| Mar 17, 2026 | New CVE Received | [email protected] |