CVE-2026-4271

MEDIUM

Libsoup: libsoup: denial of service via use-after-free in http/2 server

Title source: cna
STIX 2.1

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).

References (6)

Core 6
Core References
Issue Tracking, X_Refsource_Redhat issue-tracking x_refsource_redhat
RHBZ#2448044
https://bugzilla.redhat.com/show_bug.cgi?id=2448044
Vendor Advisory vendor-advisory x_refsource_redhat
RHSA-2026:15968
https://access.redhat.com/errata/RHSA-2026:15968
Vdb Entry, X_Refsource_Redhat vdb-entry x_refsource_redhat
https://access.redhat.com/security/cve/CVE-2026-4271
Vendor Advisory vendor-advisory x_refsource_redhat
RHSA-2026:17482
https://access.redhat.com/errata/RHSA-2026:17482
Vendor Advisory vendor-advisory x_refsource_redhat
RHSA-2026:19143
https://access.redhat.com/errata/RHSA-2026:19143

Scores

CVSS v3 5.3
EPSS 0.0083
EPSS Percentile 52.7%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CISA SSVC

Vulnrichment
Exploitation poc
Automatable yes
Technical Impact partial

Details

CWE
CWE-416
Status published
Products (14)
gnome/libsoup
Red Hat/Red Hat Enterprise Linux 10
Red Hat/Red Hat Enterprise Linux 10 0:3.6.5-3.el10_1.11
Red Hat/Red Hat Enterprise Linux 10 0:3.6.5-3.el10_2.11
Red Hat/Red Hat Enterprise Linux 10.0 Extended Update Support 0:3.6.5-3.el10_0.15
Red Hat/Red Hat Enterprise Linux 6
Red Hat/Red Hat Enterprise Linux 7
Red Hat/Red Hat Enterprise Linux 8
Red Hat/Red Hat Enterprise Linux 9
redhat/enterprise_linux 6.0
... and 4 more
Published Mar 17, 2026
Tracked Since Mar 17, 2026