A flaw was found in libsoup, a library for handling HTTP requests. This vulnerability, known as a Use-After-Free, occurs in the HTTP/2 server implementation. A remote attacker can exploit this by sending specially crafted HTTP/2 requests that cause authentication failures. This can lead to the application attempting to access memory that has already been freed, potentially causing application instability or crashes, resulting in a Denial of Service (DoS).
History

Thu, 19 Mar 2026 19:45:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:gnome:libsoup:-:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*

Wed, 18 Mar 2026 12:15:00 +0000

Type Values Removed Values Added
First Time appeared Gnome
Gnome libsoup
Vendors & Products Gnome
Gnome libsoup

Tue, 17 Mar 2026 13:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 17 Mar 2026 12:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


Tue, 17 Mar 2026 11:30:00 +0000

Type Values Removed Values Added
Description A flaw was found in libsoup, a library for handling HTTP requests. This vulnerability, known as a Use-After-Free, occurs in the HTTP/2 server implementation. A remote attacker can exploit this by sending specially crafted HTTP/2 requests that cause authentication failures. This can lead to the application attempting to access memory that has already been freed, potentially causing application instability or crashes, resulting in a Denial of Service (DoS).
Title Libsoup: libsoup: denial of service via use-after-free in http/2 server
First Time appeared Redhat
Redhat enterprise Linux
Weaknesses CWE-416
CPEs cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:6
cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}


cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published: 2026-03-17T11:14:21.284Z

Updated: 2026-03-19T20:55:53.132Z

Reserved: 2026-03-16T14:43:58.712Z

Link: CVE-2026-4271

cve-icon Vulnrichment

Updated: 2026-03-17T12:58:28.135Z

cve-icon NVD

Status : Analyzed

Published: 2026-03-17T12:16:13.280

Modified: 2026-03-19T19:33:46.743

Link: CVE-2026-4271

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-03-16T00:00:00Z

Links: CVE-2026-4271 - Bugzilla