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Libsoup CVE-2026-2443

MEDIUM
Out-of-bounds Read (CWE-125)
2026-02-13 secalert@redhat.com
Buffer Overflow Information Disclosure Red Hat Enterprise Linux Suse Libsoup Gnome
5.3
CVSS 3.1 · NVD
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Vulnerability Assessment

Weakness
CWE
CWE-125
OWASP Top 10:2025
A06:2021 - Vulnerable and Outdated Components
ASVS 5.0
V15 - Secure Coding and Architecture Bounds checking, read limits
MITRE ATT&CK

1 technique across 1 tactic: Collection

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

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Impact

CVSS 5.3 (MEDIUM). Attack vector: Network. Complexity: Low. Privileges required: None. User interaction: None. Exploitable via remote/network.
Exploit ScenarioDerived

A remote attacker could exploit this vulnerability to a remote attacker to access portions of server memory beyond the intended respon.
This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

libsoup's improper validation of HTTP Range headers enables remote attackers to read sensitive server memory when processing specially crafted requests against vulnerable SoupServer instances. The flaw affects GNOME-based systems using certain build configurations and requires no authentication or user interaction. No patch is currently available, and exploitation likelihood remains low at 0.1% EPSS.

Earlier versions of this analysis (1)
v1 Mar 12, 2026 - 22:02 CVSS 5.3

A flaw was identified in libsoup, a widely used HTTP library in GNOME-based systems. When processing specially crafted HTTP Range headers, the library may improperly validate requested byte ranges. [CVSS 5.3 MEDIUM]

RemediationAI

Monitor vendor advisories for a patch. Restrict network access to the affected service where possible.

Affects your stack

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Checking this CVE against your own stacks and servers is part of the Basic plan and up.

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Technical ContextAI · show details

Classified as CWE-125 (Out-of-bounds Read). A flaw was identified in libsoup, a widely used HTTP library in GNOME-based systems. When processing specially crafted HTTP Range headers, the library may improperly validate requested byte ranges. In certain build configurations, this could allow a remote attacker to access portions of server memory beyond the intended response. Exploitation requires a vulnerable configuration and access to a server using the embedded SoupServer component.

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

NVD PRIMARY 5.3 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
SUSE MEDIUM
Red Hat 5.3 LOW

Primary rating from NVD.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

Lifecycle Timeline

2
Patch released
Apr 09, 2026 - 20:30 nvd
Patch available
CVE Published
Feb 13, 2026 - 12:16 nvd
MEDIUM 5.3

DescriptionCVE.org

A flaw was identified in libsoup, a widely used HTTP library in GNOME-based systems. When processing specially crafted HTTP Range headers, the library may improperly validate requested byte ranges. In certain build configurations, this could allow a remote attacker to access portions of server memory beyond the intended response. Exploitation requires a vulnerable configuration and access to a server using the embedded SoupServer component.

Executive ViewAI

Why It Matters

Organizations using A flaw should be aware of moderate risk from CVE-2026-2443, a out-of-bounds read vulnerability rated CVSS 5.3. Exploitation could cause memory corruption or application crashes. Organizations should apply vendor updates when available and monitor for exploitation.

Business Impact: Low
Compensating Controls

Apply vendor patch. If patching is delayed: enable ASLR/DEP, apply network segmentation.

Threat Intelligence Overview

EPSS Score
0.1%
Top 81% exploitable
Data Quality
4 sources
Confidence: Medium
NVD CVE.org EPSS Vendor VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.1%
Patch available Yes
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
Yes
Human Impact
Low

Priority Score

26
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +26
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Buffer Overflow HIGH

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

Affected Products (CPE)CVE.org

cpe:2.3:a:gnome:libsoup:-:*:*:*:*:*:*:*
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:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*

More in Libsoup

View all
CVE-2019-17266 CRITICAL POC
9.8 Oct 06

libsoup from versions 2.65.1 until 2.68.1 have a heap-based buffer over-read because soup_ntlm_parse_challenge() in soup
CVE-2024-52530 HIGH POC
7.5 Nov 11

GNOME libsoup before 3.6.0 allows HTTP request smuggling in some configurations because '\0' characters at the end of he
CVE-2025-2784 MEDIUM POC
6.5 Apr 03

A flaw was found in libsoup. Rated high severity (CVSS 7.0), this vulnerability is remotely exploitable, no authenticati
CVE-2024-52531 MEDIUM POC
6.5 Nov 11

GNOME libsoup before 3.6.1 allows a buffer overflow in applications that perform conversion to UTF-8 in soup_header_pars
CVE-2026-102560 CRITICAL
9.8 Sep 29

A heap buffer overflow exists in libsoup's WebSocket permessage-deflate compression path: when a very large outbound mes
CVE-2026-1536 MEDIUM POC
5.8 Jan 28

HTTP header injection in libsoup through CRLF sequences in the Content-Disposition header allows unauthenticated remote

CVE-2026-1467 MEDIUM POC
5.8 Jan 27

libsoup's improper handling of URL-decoded input in HTTP proxy configurations allows remote attackers to inject CRLF seq
CVE-2018-12910 CRITICAL
9.8 Jul 05

The get_cookies function in soup-cookie-jar.c in libsoup 2.63.2 allows attackers to have unspecified impact via an empty
CVE-2026-102559 HIGH
8.6 Sep 29

Heap memory corruption in libsoup can be triggered when a WebSocket client using libsoup constructs a masked outgoing fr
CVE-2026-102558 HIGH
8.6 Sep 29

Heap out-of-bounds read in libsoup's WebSocket implementation allows a remote, unauthenticated peer to trigger a heap bu
CVE-2026-102557 HIGH
8.6 Sep 29

Heap corruption and denial of service in libsoup stem from unbounded WebSocket message reassembly: the code accumulates

CVE-2026-102556 HIGH
8.6 Sep 29

A type-confusion memory-safety flaw in libsoup's WebSocket handling can crash or corrupt the heap of applications that p

Same weakness CWE-125 – Out-of-bounds Read

View all
CVE-2014-0160 HIGH POC
7.5
CVE-2016-5198 HIGH POC
8.8
CVE-2025-5777 CRITICAL POC
9.3
CVE-2016-1646 HIGH POC
8.8
CVE-2017-5030 HIGH POC
8.8
CVE-2016-4523 HIGH
7.5
CVE-2024-48456 HIGH POC
7.5
CVE-2024-48457 HIGH POC
7.5

Same technique Buffer Overflow

View all
CVE-2017-7269 CRITICAL POC
9.8
CVE-2015-5119 CRITICAL POC
9.8
CVE-2015-3113 CRITICAL POC
9.8
CVE-2011-2462 CRITICAL POC
9.8
CVE-2020-0796 CRITICAL POC
10.0
CVE-2019-11043 CRITICAL POC
9.8
CVE-2009-0927 HIGH POC
8.8
CVE-2012-1889 HIGH POC
8.8

Vendor StatusVendor

SUSE

Severity: Medium
Product Status
Container suse/sl-micro/6.0/baremetal-os-container:2.1.3-6.53 Container suse/sl-micro/6.0/toolbox:13.2-9.12 Affected
Image SLES12-SP5-SAP-Azure-LI-BYOS-Production Image SLES12-SP5-SAP-Azure-VLI-BYOS-Production Affected
SUSE Linux Enterprise Desktop 15 SP7 SUSE Linux Enterprise High Performance Computing 15 SP7 SUSE Linux Enterprise Module for Basesystem 15 SP7 SUSE Linux Enterprise Server 15 SP7 SUSE Linux Enterprise Server for SAP Applications 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Fixed

References

Advisories & patches
ADVISORY https://vuldb.com/?id.345893 ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:0657/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:0658/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:0689/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:0690/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:0703/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:0834/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:20529/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:20649/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:20752/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:20902/ REF https://access.redhat.com/security/cve/CVE-2026-2443 REF https://bugzilla.redhat.com/show_bug.cgi?id=2439671 REF https://gitlab.gnome.org/GNOME/libsoup/-/issues/487

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