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CVE-2026-4271

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

Published: Mar 17, 2026Updated: May 19, 2026 Sources: CVE List NVD BDUCWE-416
NVD MITRE
5.3CVSSMEDIUM
EPSS Score
0.8%
Top 47.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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 Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:L
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:LAvailability
Low
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Weaknesses

CWE-416

Affected Products

Red Hat Enterprise LinuxRed Hat Inc.
On-premOS
Operating Systems / linux-distro
libsoupGNOME Foundation
Mixed
OSS Libraries / generic-library
Red Hat Enterprise Linux 10Red Hat
On-premOS
Operating Systems / linux-distro
Red Hat Enterprise Linux 10.0 Extended Update SupportRed Hat
On-premOS
Operating Systems / linux-distro
Red Hat Enterprise Linux 6Red Hat
On-premOS
Operating Systems / linux-distro
red hat inc.commercialUSOperating Systemsaka red hat
gnome foundationoss-projectUSOSS Librariesaka libsoup, gnu image manipulation program (gimp), gvfs
red hatcommercialUSOperating Systemsaka red hat
and 5 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available
Workaround Available

MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://gitlab.gnome.org/GNOME/libsoup/-/issues/496
gitlab.gnome.org
https://access.redhat.com/security/cve/cve-2026-4271
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:15968
access.redhat.com
and 5 more references View all →

Timeline

Published
Mar 17, 2026
Last Updated
May 19, 2026

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