CVE-2026-4271

HIGH EPSS 52.9%

Published Mar 17, 20263mo ago · Modified Jun 17, 20262w ago

7.5 CVSS 3.1

High

Published Mar 17, 2026 3mo ago

Last Modified Jun 17, 2026 2w ago

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).

CVSS Details

Base Score

7.5

Exploitability

3.9

Impact

3.6

Vector string

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector Network

Attack Complexity Low

Privileges Required None

User Interaction None

Scope Unchanged

Confidentiality None

Integrity None

Availability High

Threat Intelligence

EPSS Exploit Probability

52.9% percentile

Exploit & Patch Status

Public Exploit Known

No Patch Available

Weaknesses 1

CWE-416 Use After Free Memory Safety

Affected Products 6

Vendor	Product	Version	Range
gnome	libsoup	*	any
redhat	enterprise_linux	6.0	any
redhat	enterprise_linux	7.0	any
redhat	enterprise_linux	8.0	any
redhat	enterprise_linux	9.0	any
redhat	enterprise_linux	10.0	any

References 6

access.redhat.com https://access.redhat.com/errata/RHSA-2026:15968
access.redhat.com https://access.redhat.com/errata/RHSA-2026:17482
access.redhat.com https://access.redhat.com/errata/RHSA-2026:19143
access.redhat.com https://access.redhat.com/security/cve/CVE-2026-4271

Vendor Advisory
bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=2448044

Issue TrackingVendor Advisory
gitlab.gnome.org https://gitlab.gnome.org/GNOME/libsoup/-/issues/496

ExploitIssue TrackingVendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.