What is the CVSS score of CVE-2026-1539?

CVE-2026-1539 has a CVSS 3.1 base score of 5.8 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N. EPSS exploitation probability: 0.0%.

How to fix or mitigate CVE-2026-1539?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

Libsoup CVE-2026-1539

MEDIUM

Insertion of Sensitive Information Into Sent Data (CWE-201)

2026-01-28 secalert@redhat.com

Information Disclosure Red Hat Enterprise Linux Suse Libsoup Gnome

5.8

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-201 OWASP Top 10:2025 A01:2025 - Broken Access Control ASVS 5.0 V14 - Data Protection Outbound data filtering
Impact	CVSS 5.8 (MEDIUM). Attack vector: Network. Complexity: Low. Privileges required: None. User interaction: None.
Exploit ScenarioDerived	An attacker could exploit this vulnerability to compromise the affected system.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).

Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

libsoup's HTTP redirect handling fails to strip Proxy-Authorization headers when requests are forwarded to different hosts, allowing proxy credentials to be exposed to unintended third-party servers. Applications relying on libsoup for HTTP communication are vulnerable to disclosure of sensitive proxy authentication data. No patch is currently available.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 21:54 CVSS 5.8

A flaw was found in the libsoup HTTP library that can cause proxy authentication credentials to be sent to unintended destinations. [CVSS 5.8 MEDIUM]

RemediationAI

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

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

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

Technical ContextAI · show details

A flaw was found in the libsoup HTTP library that can cause proxy authentication credentials to be sent to unintended destinations. When handling HTTP redirects, libsoup removes the Authorization header but does not remove the Proxy-Authorization header if the request is redirected to a different host. As a result, sensitive proxy credentials may be leaked to third-party servers. Applications using libsoup for HTTP communication may unintentionally expose proxy authentication data.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 5.8 MEDIUM

AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N

SUSE MEDIUM

Red Hat 5.8 MEDIUM

Primary rating from NVD.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

Low

Integrity

None

Availability

None

Lifecycle Timeline

Patch released

Apr 09, 2026 - 14:30 nvd

Patch available

CVE Published

Jan 28, 2026 - 16:16 nvd

MEDIUM 5.8

DescriptionCVE.org

Executive ViewAI

Why It Matters

Organizations using A flaw should be aware of moderate risk from CVE-2026-1539 rated CVSS 5.8. Exploitation could compromise the security of affected deployments. Organizations should apply vendor updates when available and monitor for exploitation.

Business Impact: Low

Compensating Controls

Apply vendor patch. If patching is delayed: restrict network access and enable monitoring.

Threat Intelligence Overview

EPSS Score

0.0%

Top 86% 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 0.0%

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

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +29

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

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 Act Now 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 This Week 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 This Month 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 This Month 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 Act Now

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 This Month 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 This Month 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 Act Now

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 This Week

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 This Week

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 This Week

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 This Week

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-201 – Insertion of Sensitive Information Into Sent Data

View all

CVE-2026-39912 CRITICAL POC

9.1

CVE-2021-26566 CRITICAL POC

9.0

CVE-2026-27934 HIGH POC

8.7

CVE-2026-67425 HIGH POC

8.6

CVE-2025-60188 HIGH POC

7.5

CVE-2025-58098 HIGH POC

8.3

CVE-2024-43283 MEDIUM POC

5.3

CVE-2026-105849 HIGH POC

7.7

Same technique Information Disclosure

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CVE-2019-2725 CRITICAL POC

9.8

CVE-2021-34523 CRITICAL POC

9.0

CVE-2013-2251 CRITICAL POC

9.8

CVE-2017-5638 CRITICAL POC

9.8

CVE-2025-24813 CRITICAL POC

9.8

CVE-2025-68613 HIGH POC

8.8

CVE-2015-1701 HIGH POC

7.8

CVE-2017-0147 HIGH POC

7.5

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

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