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Libsoup CVE-2026-1467

MEDIUM
Improper Neutralization of CRLF Sequences ('CRLF Injection') (CWE-93)
2026-01-27 secalert@redhat.com
Authentication Bypass Red Hat Enterprise Linux Suse Libsoup Gnome
5.8
CVSS 3.1 · NVD
View

Vulnerability Assessment

Weakness
CWE
CWE-93
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization CRLF sequence sanitization
Impact

CVSS 5.8 (MEDIUM). Attack vector: Network. Complexity: Low. Privileges required: None. User interaction: None. Exploitation no authentication required. Exploitable via remote/network.
Exploit ScenarioDerived

A remote attacker without authentication could exploit this vulnerability to unintended or unauthorized HTTP requests being forwarded by the proxy, potential.
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 handling of URL-decoded input in HTTP proxy configurations allows remote attackers to inject CRLF sequences into the Host header, enabling injection of arbitrary HTTP headers or request bodies. Public exploit code exists for this vulnerability, which could allow attackers to manipulate downstream services through compromised proxy requests. Affected applications using libsoup with HTTP proxy functionality are at risk of integrity compromise, though no patch is currently available.

Earlier versions of this analysis (1)
v1 Mar 12, 2026 - 21:55 CVSS 5.8

A flaw was found in libsoup, an HTTP client library. This vulnerability, known as CRLF (Carriage Return Line Feed) Injection, occurs when an HTTP proxy is configured and the library improperly handles URL-decoded input used to create the Host header. [CVSS 5.8 MEDIUM]

RemediationAI

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

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Technical ContextAI · show details

was found in libsoup, an HTTP client library. This vulnerability, known as CRLF (Carriage Return Line Feed) Injection, occurs when an HTTP proxy is configured and the library improperly handles URL-decoded input used to create the Host header. A remote attacker can exploit this by providing a specially crafted URL containing CRLF sequences, allowing them to inject additional HTTP headers or complete HTTP request bodies. This can lead to unintended or unauthorized HTTP requests being forwarded by

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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:N/I:L/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
None
Integrity
Low
Availability
None

Lifecycle Timeline

3
Patch released
Apr 09, 2026 - 14:30 nvd
Patch available
PoC Detected
Mar 25, 2026 - 14:20 vuln.today
Public exploit code
CVE Published
Jan 27, 2026 - 10:15 nvd
MEDIUM 5.8

DescriptionCVE.org

A flaw was found in libsoup, an HTTP client library. This vulnerability, known as CRLF (Carriage Return Line Feed) Injection, occurs when an HTTP proxy is configured and the library improperly handles URL-decoded input used to create the Host header. A remote attacker can exploit this by providing a specially crafted URL containing CRLF sequences, allowing them to inject additional HTTP headers or complete HTTP request bodies. This can lead to unintended or unauthorized HTTP requests being forwarded by the proxy, potentially impacting downstream services.

Executive ViewAI

Why It Matters

Organizations using A flaw should be aware of moderate risk from CVE-2026-1467 rated CVSS 5.8. Exploitation could compromise the security of affected deployments. Proof-of-concept code is publicly available. 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
0.1%
Top 77% exploitable
Exploit
POC
Public exploit code exists
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 Yes
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
Poc
System Exposure· derived
Open
Automatable· derived
Yes
Human Impact
Low

Priority Score

49
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +29
PoC: +20
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Authentication Bypass CRITICAL

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

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

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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-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
CVE-2026-102555 HIGH
8.2 Sep 29

Out-of-bounds read and application crash in libsoup's soup_uri_decode_data_uri() affect applications that pass attacker-

Same weakness CWE-93 – Improper Neutralization of CRLF Sequences ('CRLF Injection')

View all
CVE-2016-3115 MEDIUM POC
6.4
CVE-2026-84372 CRITICAL POC
9.8
CVE-2021-39172 HIGH POC
8.8
CVE-2026-23953 HIGH POC
8.7
CVE-2026-116232 HIGH POC
8.6
CVE-2026-54511 HIGH POC
8.6
CVE-2026-116235 HIGH POC
8.5
CVE-2026-116231 HIGH POC
8.6

Same technique Authentication Bypass

View all
CVE-2015-3306 CRITICAL POC
10.0
CVE-2023-22515 CRITICAL POC
9.8
CVE-2012-4681 CRITICAL POC
9.8
CVE-2013-2465 CRITICAL POC
9.8
CVE-2011-3544 CRITICAL POC
9.8
CVE-2022-40684 CRITICAL POC
9.8
CVE-2025-61882 CRITICAL POC
9.8
CVE-2024-0012 CRITICAL POC
9.3

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://ubuntu.com/security/notices/USN-8780-1 ADVISORY https://vuldb.com/?id.342952 ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:0788/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:0792/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:0796/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:0811/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:0833/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:0834/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:20649/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:20727/ 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-2026-1467 REF https://bugzilla.redhat.com/show_bug.cgi?id=2433174

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